ZyXEL Communications ZyWALL 10 User manual

ZyWALL 10
Internet Security Gateway
User’s Guide
Version 3.20
November 2000

ZyWALL 10 Internet Security Gateway
ii Copyright
ZyWALL 10
Internet Security Gateway
Copyright
Copyright © 2000 by ZyXEL Communications Corporation.
The contents of this publication may not be reproduced in any part or as a whole, transcribed, stored in a
retrieval system, translated into any language, or transmitted in any form or by any means, electronic,
mechanical, magnetic, optical, chemical, photocopying, manual, or otherwise, without the prior written
permission of ZyXEL Communications Corporation.
Published by ZyXEL Communications Corporation. All rights reserved.
Disclaimer
ZyXEL does not assume any liability arising out of the application or use of any products, or software
described herein. Neither does it convey any license under its patent rights nor the patent rights of others.
ZyXEL further reserves the right to make changes in any products described herein without notice. This
publication is subject to change without notice.
Trademarks
Trademarks mentioned in this publication are used for identification purposes only and may be properties of
their respective owners.

ZyWALL 10 Internet Security Gateway
FCC Statement iii
Federal Communications Commission (FCC) Interference Statement
This device complies with Part 15 of FCC rules. Operation is subject to the following two conditions:
This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause undesired
operations.
This equipment has been tested and found to comply with the limits for a CLASS B digital device pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a commercial environment. This equipment generates, uses, and can radiate radio frequency
energy, and if not installed and used in accordance with the instructions, may cause harmful interference to
radio communications.
If this equipment does cause harmful interference to radio/television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of
the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and the receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
Notice 1
Changes or modifications not expressly approved by the party responsible for compliance could void the
user's authority to operate the equipment.
Notice 2
Shielded RS-232 cables are required to be used to ensure compliance with FCC Part 15, and it is the
responsibility of the user to provide and use shielded RS-232 cables.

ZyWALL 10 Internet Security Gateway
iv Canadian Users
Information for Canadian Users
The Industry Canada label identifies certified equipment. This certification means that the equipment meets
certain telecommunications network protective, operation, and safety requirements. The Industry Canada
does not guarantee that the equipment will operate to a user's satisfaction.
Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of
the local telecommunications company. The equipment must also be installed using an acceptable method
of connection. In some cases, the company's inside wiring associated with a single line individual service
may be extended by means of a certified connector assembly. The customer should be aware that the
compliance with the above conditions may not prevent degradation of service in some situations.
Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated
by the supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions,
may give the telecommunications company cause to request the user to disconnect the equipment.
For their own protection, users should ensure that the electrical ground connections of the power utility,
telephone lines, and internal metallic water pipe system, if present, are connected together. This precaution
may be particularly important in rural areas.
Caution
Users should not attempt to make such connections themselves, but should contact the appropriate
electrical inspection authority, or electrician, as appropriate.
Note
This digital apparatus does not exceed the class A limits for radio noise emissions from digital apparatus set
out in the radio interference regulations of Industry Canada.

ZyWALL 10 Internet Security Gateway
Declaration of Conformity v
Declaration of Conformity
We, the Manufacturer/Importer,
ZyXEL Communications Corp.
No. 6, Innovation Rd. II,
Science-Based Industrial Park,
Hsinchu, Taiwan, 300 R.O.C
declare that the product
ZyWALL 10
is in conformity with
(reference to the specification under which conformity is declared)
Standard Standard Item Version
•EN 55022 Radio disturbance characteristics – Limits and method of
measurement.
1994
•EN 61000-3-2 Disturbance in supply system caused by household appliances
and similar electrical equipment “Harmonics”.
1995
•EN 61000-3-3 Disturbance in supply system caused by household appliances
and similar electrical equipment “Voltage fluctuations”.
1995
•EN 61000-4-2 Electrostatic discharge immunity test – Basic EMC Publication 1995
•EN 61000-4-3 Radiated, radio-frequency, electromagnetic field immunity test 1996
•EN 61000-4-4 Electrical fast transient / burst immunity test - Basic EMC
Publication
1995
•EN 61000-4-5 Surge immunity test 1995
•EN 61000-4-6 Immunity to conducted disturbances, induced by radio-frequency
fields
1996
•EN 61000-4-8 1993
•EN 61000-4-11 Voltage dips, short interruptions and voltage variations immunity
tests
1994

ZyWALL 10 Internet Security Gateway
vi CE Doc

ZyWALL 10 Internet Security Gateway
Warranty vii
ZyXEL Limited Warranty
ZyXEL warrants to the original end user (purchaser) that this product is free from any defects in materials or
workmanship for a period of up to two years from the date of purchase. During the warranty period, and upon
proof of purchase, should the product have indications of failure due to faulty workmanship and/or materials,
ZyXEL will, at its discretion, repair or replace the defective products or components without charge for either
parts or labor, and to whatever extent it shall deem necessary to restore the product or components to
proper operating condition. Any replacement will consist of a new or re-manufactured functionally equivalent
product of equal value, and will be solely at the discretion of ZyXEL. This warranty shall not apply if the
product is modified, misused, tampered with, damaged by an act of God, or subjected to abnormal working
conditions.
Note
Repair or replacement, as provided under this warranty, is the exclusive remedy of the purchaser. This
warranty is in lieu of all other warranties, express or implied, including any implied warranty of
merchantability or fitness for a particular use or purpose. ZyXEL shall in no event be held liable for indirect or
consequential damages of any kind of character to the purchaser.
To obtain the services of this warranty, contact ZyXEL's Service Center; refer to the separate Warranty Card
for your Return Material Authorization number (RMA). Products must be returned Postage Prepaid. It is
recommended that the unit be insured when shipped. Any returned products without proof of purchase or
those with an out-dated warranty will be repaired or replaced (at the discretion of ZyXEL) and the customer
will be billed for parts and labor. All repaired or replaced products will be shipped by ZyXEL to the
corresponding return address, Postage Paid (USA and territories only). If the customer desires some other
return destination beyond the U.S. borders, the customer shall bear the cost of the return shipment. This
warranty gives you specific legal rights, and you may also have other rights that vary from state to state.
Please register your ZyWALL (fast, easy online registration at www.zyxel.com) for free
product updates and information.

ZyWALL 10 Internet Security Gateway
viii Customer Support
Customer Support
When you contact your customer support representative please have the following information ready:
♦Prestige Model and serial number.
♦Information in Menu 24.2.1 –System Information.
♦Warranty Information.
♦Date you received your Prestige.
♦Brief description of the problem and the steps you took to solve it.
EMAIL – Support Telephone Web Site
Method
Region EMAIL – Sales Fax FTP Site
Regular Mail
[e-mail]
[e-mail]
[phone] www.zyxel.com
www.europe.zyxel.com
Worldwide
[e-mail] [phone] ftp.europe.zyxel.com
ZyXEL Communications
Corp., 6 Innovation Road II,
Science-Based Industrial
Park, HsinChu, Taiwan.
[e-mail] [phone]
800-255-4101
www.zyxel.com
North
America [e-mail] [phone] ftp.zyxel.com
ZyXEL Communications Inc.,
1650 Miraloma Avenue,
Placentia, CA 92870, U.S.A.
[e-mail] [phone] www.zyxel.dk
Scandinavia sal[email protected] [phone] ftp.zyxel.dk
ZyXEL Communications A/S,
Columbusvej 5, 2860
Soeborg, Denmark.
[e-mail] [phone]
0810-1-ZyXEL
0810-1-99935
www.zyxel.at
Austria [e-mail] [phone] ftp.zyxel.at
Note: for Austrian users with *.at
domain only!
ZyXEL Communications
Services GmbH.,
Thaliastrasse 125a/2/2/4,
A-1160 Vienna, Austria
[e-mail] [phone]
0180-5213247
Tech Support hotline
0180-5099935
RMA/Repair hotline
www.zyxel.de
Germany
sale[email protected] [phone] ftp.europe.zyxel.com
ZyXEL Deutschland GmbH.,
Adenauerstr. 20/A4, D-52146
Wuerselen, Germany.

ZyWALL 10 Internet Security Gateway
Table of Contents ix
Table of Contents
Customer Support ...................................................................................................................................... viii
Table of Contents ......................................................................................................................................... ix
List of Figures.............................................................................................................................................xvi
List of Tables ........................................................................................................................................... xxiii
Preface .................................................................................................................................................... xxvii
Getting Started ................................................................................................................................................. I
Chapter 1 Getting to Know Your ZyWALL............................................................................................... 1-1
1.1 The ZyWALL 10 Internet Security Gateway ............................................................................. 1-1
1.2 Features of The ZyWALL 10 ..................................................................................................... 1-1
1.3 Applications for ZyWALL 10 .................................................................................................... 1-3
1.3.1 Broadband Internet Access via Cable or xDSL Modem..................................................... 1-3
Chapter 2 Hardware Installation & Initial Setup........................................................................................ 2-1
2.1 Front Panel LEDs and Back Panel Ports .................................................................................... 2-1
2.1.1 Front Panel LEDs ............................................................................................................... 2-1
2.2 ZyWALL 10 Rear Panel and Connections ................................................................................. 2-2
2.3 Additional Installation Requirements.........................................................................................2-3
2.4 Power Up Your ZyWALL.......................................................................................................... 2-4
2.5 Navigating the SMT Interface .................................................................................................... 2-5
2.5.1 Main Menu ......................................................................................................................... 2-5
2.5.2 System Management Terminal Interface Summary ........................................................... 2-6
2.6 Changing the System Password.................................................................................................. 2-7
2.6.1 Resetting the ZyWALL ...................................................................................................... 2-7
2.7 General Setup ............................................................................................................................. 2-7
2.7.1 Dynamic DNS .................................................................................................................... 2-8
2.7.2 Configuring Dynamic DNS ................................................................................................ 2-9
2.8 WAN Setup .............................................................................................................................. 2-10
2.9 LAN Setup................................................................................................................................ 2-11
2.9.1 LAN Port Filter Setup....................................................................................................... 2-12
Chapter 3 Internet Access .......................................................................................................................... 3-1

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xTable of Contents
3.1 TCP/IP and DHCP for LAN .......................................................................................................3-1
3.1.1 Factory LAN Defaults.........................................................................................................3-1
3.1.2 IP Address and Subnet Mask ..............................................................................................3-1
3.1.3 Private IP Addresses ...........................................................................................................3-2
3.1.4 RIP Setup ............................................................................................................................3-2
3.1.5 DHCP Configuration...........................................................................................................3-3
3.1.6 IP Multicast .........................................................................................................................3-3
3.1.7 IP Alias................................................................................................................................3-4
3.2 TCP/IP and DHCP Ethernet Setup..............................................................................................3-4
3.2.1 IP Alias Setup......................................................................................................................3-7
3.3 Internet Access Setup..................................................................................................................3-8
3.3.1 Ethernet Encapsulation........................................................................................................3-8
3.3.2 PPTP Encapsulation ............................................................................................................3-9
3.3.3 Configuring the PPTP Client.............................................................................................3-10
3.3.4 PPPoE Encapsulation ........................................................................................................3-10
3.4 Basic Setup Complete ...............................................................................................................3-12
Advanced Applications...................................................................................................................................II
Chapter 4 Remote Node Setup ...................................................................................................................4-1
4.1 Remote Node Profile...................................................................................................................4-1
4.1.1 Ethernet Encapsulation........................................................................................................4-1
4.1.2 PPPoE Encapsulation ..........................................................................................................4-3
4.1.3 PPTP Encapsulation ............................................................................................................4-4
4.2 Editing TCP/IP Options (with Ethernet Encapsulation)..............................................................4-6
4.2.1 Editing TCP/IP Options (with PPTP Encapsulation) ..........................................................4-7
4.2.2 Editing TCP/IP Options (with PPPoE Encapsulation) ........................................................4-9
4.3 Remote Node Filter.....................................................................................................................4-9
Chapter 5 IP Static Route Setup .................................................................................................................5-1
5.1 IP Static Route Setup ..................................................................................................................5-2
Chapter 6 Network Address Translation (NAT) .........................................................................................6-1
6.1 Introduction.................................................................................................................................6-1
6.1.1 NAT Definitions..................................................................................................................6-1
6.1.2 What NAT Does..................................................................................................................6-1
6.1.3 How NAT works .................................................................................................................6-2
6.1.4 NAT Mapping Types ..........................................................................................................6-2
6.1.5 SUA (Single User Account) Versus NAT...........................................................................6-3

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Table of Contents xi
6.1.6 NAT Application ................................................................................................................ 6-4
6.2 SMT Menus................................................................................................................................ 6-5
6.2.1 Applying NAT in the SMT Menus..................................................................................... 6-5
6.2.2 Configuring NAT ............................................................................................................... 6-6
6.2.3 Address Mapping Sets and NAT Server Sets: .................................................................... 6-7
6.3 NAT Server Sets....................................................................................................................... 6-12
6.3.1 Multiple Servers behind NAT .......................................................................................... 6-12
6.3.2 Configuring a Server behind NAT ................................................................................... 6-13
6.4 Examples .................................................................................................................................. 6-14
6.4.1 Internet Access Only ........................................................................................................ 6-14
6.4.2 Example 2 – Internet Access with an Inside Server ......................................................... 6-16
6.4.3 Example 3 – General Case................................................................................................ 6-16
6.4.4 Example 4 –NAT Unfriendly Application Programs ....................................................... 6-20
Advanced Management ................................................................................................................................ III
Chapter 7 Filter Configuration................................................................................................................... 7-1
7.1 About Filtering ........................................................................................................................... 7-1
7.1.1 The Filter Structure of the ZyWALL.................................................................................. 7-2
7.2 Configuring a Filter Set.............................................................................................................. 7-4
7.2.1 Filter Rules Summary Menu............................................................................................... 7-6
7.2.2 Configuring a Filter Rule.................................................................................................... 7-7
7.2.3 TCP/IP Filter Rule.............................................................................................................. 7-7
7.2.4 Generic Filter Rule ........................................................................................................... 7-12
7.3 Example Filter .......................................................................................................................... 7-14
7.4 Filter Types and NAT............................................................................................................... 7-16
7.5 Firewall..................................................................................................................................... 7-17
7.6 Applying a Filter and Factory Defaults .................................................................................... 7-17
7.6.1 LAN traffic ....................................................................................................................... 7-17
7.6.2 Remote Node Filters......................................................................................................... 7-18
Chapter 8 SNMP Configuration................................................................................................................. 8-1
8.1 About SNMP .............................................................................................................................. 8-1
8.2 Configuring SNMP..................................................................................................................... 8-1
Chapter 9 System Information & Diagnosis .............................................................................................. 9-1
9.1 System Status ............................................................................................................................. 9-2

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xii Table of Contents
9.2 System Information and Console Port Speed..............................................................................9-4
9.2.1 System Information.............................................................................................................9-4
9.2.2 Console Port Speed .............................................................................................................9-5
9.3 Log and Trace .............................................................................................................................9-5
9.3.1 Viewing Error Log ..............................................................................................................9-6
9.3.2 UNIX Syslog.......................................................................................................................9-6
9.3.3 Call-Triggering Packet ......................................................................................................9-10
9.4 Diagnostic .................................................................................................................................9-10
9.4.1 WAN DHCP .....................................................................................................................9-11
Chapter 10 Transferring Files ...................................................................................................................10-1
10.1 Filename conventions................................................................................................................10-1
10.1.1 Firmware Development.....................................................................................................10-2
10.2 Backup Configuration ...............................................................................................................10-2
10.3 Restore Configuration ...............................................................................................................10-3
10.4 Upload Firmware ......................................................................................................................10-3
10.4.1 Uploading the Router Firmware........................................................................................10-3
10.4.2 Uploading Router Configuration File................................................................................10-4
10.5 TFTP File Transfer....................................................................................................................10-5
10.5.1 Example TFTP Command.................................................................................................10-6
10.6 FTP File Transfer ......................................................................................................................10-7
10.6.1 Using the FTP command from the DOS Prompt...............................................................10-8
Chapter 11 System Maintenance & Information ......................................................................................11-1
11.1 Command Interpreter Mode......................................................................................................11-1
11.2 Call Control Support .................................................................................................................11-2
11.2.1 Budget Management .........................................................................................................11-2
11.2.2 Call History .......................................................................................................................11-3
11.3 Time and Date Setting...............................................................................................................11-4
11.3.1 How often does the ZyWALL update the time? ...............................................................11-4
11.4 Remote Management Setup ......................................................................................................11-6
11.5 Boot Commands........................................................................................................................11-7
Chapter 12 Telnet Configuration and Capabilities....................................................................................12-1
12.1 About Telnet Configuration ......................................................................................................12-1
12.2 Telnet Under NAT ....................................................................................................................12-1

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Table of Contents xiii
12.3 Telnet Capabilities.................................................................................................................... 12-1
12.3.1 Single Administrator ........................................................................................................ 12-1
12.3.2 System Timeout................................................................................................................ 12-2
12.4 Telnet Under the Firewall......................................................................................................... 12-2
Firewall and Content Filters......................................................................................................................... IV
Chapter 13 What is a Firewall?................................................................................................................ 13-1
13.1 Types of Firewalls .................................................................................................................... 13-1
13.1.1 Packet Filtering Firewalls................................................................................................. 13-1
13.1.2 Application-level Firewalls .............................................................................................. 13-1
13.1.3 Stateful Inspection firewalls ............................................................................................. 13-2
13.2 Introduction to ZyXEL’s Firewall............................................................................................ 13-2
13.3 Denial of Service ...................................................................................................................... 13-3
13.3.1 Basics................................................................................................................................ 13-3
13.3.2 Types of DoS attacks........................................................................................................ 13-4
13.4 Stateful Inspection.................................................................................................................... 13-6
13.4.1 Stateful Inspection Process............................................................................................... 13-7
13.4.2 Stateful Inspection & the ZyWALL ................................................................................. 13-8
13.4.3 TCP Security .................................................................................................................... 13-8
13.4.4 UDP/ICMP Security......................................................................................................... 13-9
13.4.5 Upper Layer Protocols...................................................................................................... 13-9
13.5 Guidelines For Enhancing Security With Your Firewall.......................................................... 13-9
13.5.1 Security In General......................................................................................................... 13-10
Chapter 14 Introducing the ZyWALL Firewall........................................................................................ 14-1
14.1 SMT Menus.............................................................................................................................. 14-1
14.1.1 View Firewall Log............................................................................................................ 14-2
14.1.2 Attack Types..................................................................................................................... 14-2
14.2 The Big Picture – Filtering, Firewall and NAT........................................................................ 14-5
14.3 Packet Filtering Vs Firewall..................................................................................................... 14-6
14.3.1 Packet Filtering:................................................................................................................ 14-6
14.3.2 Firewall:............................................................................................................................ 14-7
Chapter 15 Introducing the ZyWALL Web Configurator ........................................................................ 15-1
15.1 Web Configurator Login and Welcome Screens ...................................................................... 15-1
15.2 Enabling the Firewall ............................................................................................................... 15-2
15.3 E-Mail....................................................................................................................................... 15-3

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xiv Table of Contents
15.3.1 What are Alerts?................................................................................................................15-3
15.3.2 What are Logs? .................................................................................................................15-4
15.3.3 SMTP Error Messages ......................................................................................................15-6
15.3.4 Example E-Mail Log.........................................................................................................15-6
15.4 Attack Alert...............................................................................................................................15-7
15.4.1 Threshold Values: .............................................................................................................15-8
15.4.2 Half-Open Sessions...........................................................................................................15-8
Chapter 16 Creating Custom Rules ..........................................................................................................16-1
16.1 Rules Overview.........................................................................................................................16-1
16.2 Rule Logic Overview ................................................................................................................16-1
16.2.1 Rule Checklist ...................................................................................................................16-1
16.2.2 Security Ramifications ......................................................................................................16-2
16.2.3 Key Fields For Configuring Rules ....................................................................................16-2
16.3 Connection Direction ................................................................................................................16-3
16.3.1 LAN to WAN Rules..........................................................................................................16-3
16.3.2 WAN to LAN Rules..........................................................................................................16-3
16.4 Services Supported....................................................................................................................16-4
16.5 Rule Summary...........................................................................................................................16-6
16.5.1 Creating/Editing Firewall Rules........................................................................................16-8
16.5.2 Source & Destination Addresses.....................................................................................16-10
16.6 Timeout ...................................................................................................................................16-12
16.6.1 Factors Influencing Choices for Timeout Values:...........................................................16-12
Chapter 17 Custom Ports..........................................................................................................................17-1
17.1 Introduction...............................................................................................................................17-1
17.2 Creating/Editing A Custom Port ...............................................................................................17-2
Chapter 18 Logs .......................................................................................................................................18-1
18.1 Log Screen ................................................................................................................................18-1
Chapter 19 Example Firewall Rules .........................................................................................................19-1
19.1 Examples...................................................................................................................................19-1
19.1.1 Example 1 - Firewall Rule To Allow Web Service From The Internet.............................19-1
Example 2 – Small Office With Mail, FTP and Web Servers...........................................................19-6
19.1.3 Example 3: DHCP Negotiation and Syslog Connection from the Internet .....................19-11
Chapter 20 Content Filtering ....................................................................................................................20-1

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Table of Contents xv
20.1 Restrict Web Features............................................................................................................... 20-1
20.1.1 ActiveX ............................................................................................................................ 20-1
20.1.2 Java................................................................................................................................... 20-1
20.1.3 Cookies............................................................................................................................. 20-2
20.1.4 Web Proxy........................................................................................................................ 20-2
20.2 Blocking URLs......................................................................................................................... 20-2
20.3 Content Filtering Using the Web Configurator ........................................................................ 20-2
Troubleshooting, Appendices, Glossary and Index ......................................................................................V
Chapter 21 Troubleshooting..................................................................................................................... 21-1
21.1 Problems Starting Up the ZyWALL......................................................................................... 21-1
21.2 Problems with the LAN Interface............................................................................................. 21-2
21.3 Problems with the WAN interface............................................................................................ 21-2
21.4 Problems with Internet Access ................................................................................................. 21-3
21.5 Problems with the Firewall....................................................................................................... 21-3
Appendix A PPPoE...................................................................................................................................A
Appendix B PPTP....................................................................................................................................C
Appendix C Hardware Specifications....................................................................................................... E
Appendix D Important Safety Instructions ............................................................................................... F
Appendix E Firewall CLI Commands ......................................................................................................G
Appendix F Power Adapter Specs........................................................................................................ L
Glossary of Terms .........................................................................................................................................N
Index .............................................................................................................................................................X

ZyWALL 10 Internet Security Gateway
xvi List of Figures
List of Figures
Figure 1-1 Secure Internet Access via Cable ..................................................................................................1-3
Figure 1-2 Secure Internet Access via DSL....................................................................................................1-4
Figure 2-1 Front Panel ....................................................................................................................................2-1
Figure 2-2 ZyWALL 10 Rear Panel and Connections ....................................................................................2-2
Figure 2-3 Initial Screen .................................................................................................................................2-4
Figure 2-4 Password Screen............................................................................................................................2-4
Figure 2-5 ZyWALL 10 Main Menu ..............................................................................................................2-6
Figure 2-6 Menu 23 - System Security ...........................................................................................................2-7
Figure 2-7 Menu 1 - General Setup ................................................................................................................2-8
Figure 2-8 Configure Dynamic DNS..............................................................................................................2-9
Figure 2-9 Menu 2 - WAN Setup..................................................................................................................2-11
Figure 2-10 Menu 3 - LAN Setup.................................................................................................................2-12
Figure 2-11 Menu 3.1 – LAN Port Filter Setup ............................................................................................2-12
Figure 3-1 Physical Network ..........................................................................................................................3-4
Figure 3-2 Partitioned Logical Networks........................................................................................................3-4
Figure 3-3 Menu 3 - LAN Setup (10/100 Mbps Ethernet)..............................................................................3-5
Figure 3-4 Menu 3.2 - TCP/IP and DHCP Ethernet Setup .............................................................................3-5
Figure 3-5 Menu 3.2.1 - IP Alias Setup ..........................................................................................................3-7
Figure 3-6 Menu 4 - Internet Access Setup (Ethernet) ...................................................................................3-8
Figure 3-7 Internet Access Setup (PPTP) .....................................................................................................3-10
Figure 3-8 Internet Access Setup (PPPoE) ...................................................................................................3-11
Figure 4-1 Menu 11.1 Remote Node Profile for Ethernet Encapsulation .......................................................4-1
Figure 4-2 Menu 11.1 Remote Node Profile for PPPoE Encapsulation..........................................................4-3
Figure 4-3 Remote Node Profile for PPTP Encapsulation..............................................................................4-5
Figure 4-4 Remote Node Network Layer Options..........................................................................................4-6

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List of Figures xvii
Figure 4-5 Remote Node Network Layer Options ......................................................................................... 4-8
Figure 4-6 Remote Node Filter (Ethernet Encapsulation)............................................................................ 4-10
Figure 4-7 Remote Node Filter (PPPoE or PPTP Encapsulation)................................................................ 4-10
Figure 5-1 Example of Static Routing Topology ........................................................................................... 5-1
Figure 5-2 Menu 12 - IP Static Route Setup .................................................................................................. 5-2
Figure 5-3 Menu 12. 1 - Edit IP Static Route................................................................................................. 5-2
Figure 6-1 How NAT Works .......................................................................................................................... 6-2
Figure 6-2 NAT Application .......................................................................................................................... 6-4
Figure 6-3 Applying NAT for Internet Access............................................................................................... 6-5
Figure 6-4 Applying NAT to the Remote Node ............................................................................................. 6-6
Figure 6-5 Menu 15 NAT Setup..................................................................................................................... 6-7
Figure 6-6 Menu 15.1 Address Mapping Sets................................................................................................ 6-7
Figure 6-7 SUA Address Mapping Rules ...................................................................................................... 6-8
Figure 6-8 First Set in Menu 15.1.1 ............................................................................................................. 6-10
Figure 6-9 Editing an Individual Rule in a Set..............................................................................................6-11
Figure 6-10 Multiple Servers Behind NAT .................................................................................................. 6-13
Figure 6-11 Menu 15.2 – NAT Server Setup................................................................................................ 6-14
Figure 6-12 NAT Example 1 ........................................................................................................................ 6-15
Figure 6-13 Internet Access & NAT Example ............................................................................................. 6-15
Figure 6-14 NAT Example 2 ........................................................................................................................ 6-16
Figure 6-15 Specifying an Inside Sever ....................................................................................................... 6-16
Figure 6-16 NAT - Example 3...................................................................................................................... 6-17
Figure 6-17 Example 3 - Menu 11.3 ............................................................................................................ 6-18
Figure 6-18 Example 3 - Menu 15.1.1.1 ...................................................................................................... 6-18
Figure 6-19 Example 3 Final Menu 15.1.1 .................................................................................................. 6-19
Figure 6-20 Example 3 - Menu 15.2 ............................................................................................................ 6-19
Figure 6-21 NAT Example 4 ........................................................................................................................ 6-20

ZyWALL 10 Internet Security Gateway
xviii List of Figures
Figure 6-22 Example 4- Menu 15.1.1.1 - Address Mapping Rule................................................................6-21
Figure 6-23 Example 4 - Menu 15.1.1 - Address Mapping Rules ................................................................6-21
Figure 7-1 Outgoing Packet Filtering Process ................................................................................................7-1
Figure 7-2 Filter Rule Process ........................................................................................................................7-3
Figure 7-4 Menu 21 - Filter and Firewall Setup .............................................................................................7-4
Figure 7-5 Menu 21.1 - Filter Set Configuration ............................................................................................7-4
Figure 7-6 NetBIOS_WAN Filter Rules Summary.........................................................................................7-5
Figure 7-7 NetBIOS _LAN Filter Rules Summary.........................................................................................7-5
Figure 7-8 TEL_FTP_WEB_WAN Filter Rules Summary.............................................................................7-5
Figure 7-9 Menu 21.1.1.1 - TCP/IP Filter Rule ..............................................................................................7-8
Figure 7-10 Executing an IP Filter................................................................................................................7-11
Figure 7-11 Menu 21.4.1.1 - Generic Filter Rule..........................................................................................7-12
Figure 7-12 Telnet Filter Example ................................................................................................................7-14
Figure 7-13 Example Filter - Menu 21.1.1.1 ................................................................................................7-15
Figure 7-14 Example Filter Rules Summary - Menu 21.1.3.........................................................................7-16
Figure 7-15 Protocol and Device Filter Sets.................................................................................................7-17
Figure 7-16 Filtering LAN Traffic................................................................................................................7-18
Figure 7-17 Filtering Remote Node Traffic ..................................................................................................7-18
Figure 8-1 Menu 22 - SNMP Configuration...................................................................................................8-1
Figure 9-1 Menu 24 - System Maintenance....................................................................................................9-1
Figure 9-2 Menu 24.1 - System Maintenance - Status....................................................................................9-2
Figure 9-3 Menu 24.2 - System Information and Console Port Speed ...........................................................9-4
Figure 9-4 Menu 24.2.1 System Maintenance - Information.........................................................................9-4
Figure 9-5 Menu 24.2.2 - System Maintenance - Change Console Port Speed.............................................9-5
Figure 9-6 Examples of Error and Information Messages ..............................................................................9-6
Figure 9-7 Examples of Error and Information Messages ..............................................................................9-6
Figure 9-8 Menu 24.3.2 - System Maintenance - UNIX Syslog.....................................................................9-7

ZyWALL 10 Internet Security Gateway
List of Figures xix
Figure 9-9 Call-Triggering Packet Example ................................................................................................ 9-10
Figure 9-10 Menu 24.4 - System Maintenance - Diagnostic.........................................................................9-11
Figure 9-11 WAN & LAN DHCP ................................................................................................................ 9-12
Figure 10-1 Menu 24.5 - System Maintenance - Backup Configuration ..................................................... 10-2
Figure 10-2 Menu 24.6 - System Maintenance - Restore Configuration ..................................................... 10-3
Figure 10-3 Menu 24.7 - System Maintenance - Upload Firmware............................................................. 10-3
Figure 10-4 Menu 24.7.1 - System Maintenance - Upload Router Firmware.............................................. 10-4
Figure 10-5 Menu 24.7.2 - System Maintenance - Upload Router Configuration File................................ 10-5
Figure 10-6 Telnet into Menu 24.7.1............................................................................................................ 10-7
Figure 10-7 Telnet into Menu 24.7.2 - System Maintenance ....................................................................... 10-8
Figure 10-8 FTP Session Example............................................................................................................... 10-9
Figure 11-1 Command Mode in Menu 24.....................................................................................................11-1
Figure 11-2 Valid Commands........................................................................................................................11-1
Figure 11-3 Call Control ...............................................................................................................................11-2
Figure 11-4 Budget Management..................................................................................................................11-2
Figure 11-5 Call History ...............................................................................................................................11-3
Figure 11-6 System Maintenance - Time and Date Setting...........................................................................11-5
Figure 11-7 Menu 24.11 - Remote Management Control .............................................................................11-6
Figure 11-8 Option to Enter Debug Mode ....................................................................................................11-7
Figure 11-9 Boot Module Commands...........................................................................................................11-8
Figure 12-1 Telnet Configuration on a TCP/IP Network ............................................................................. 12-1
Figure 13-1 ZyWALL Firewall Application ................................................................................................ 13-3
Figure 13-2 Three-Way Handshake ............................................................................................................. 13-5
Figure 13-3 SYN Flood................................................................................................................................ 13-5
Figure 13-4 Smurf Attack ............................................................................................................................ 13-6
Figure 13-5 Stateful Inspection .................................................................................................................... 13-7
Figure 14-1 SMT Main Menu ...................................................................................................................... 14-1

ZyWALL 10 Internet Security Gateway
xx List of Figures
Figure 14-2 Menu 21 - Filter and Firewall Setup .........................................................................................14-1
Figure 14-3 Menu 21.2 - Firewall Setup.......................................................................................................14-2
Figure 14-4 View Firewall Log.....................................................................................................................14-4
Figure 14-5 Big Picture - Filtering, Firewall and NAT.................................................................................14-6
Figure 15-1 Login screen as seen in Netscape..............................................................................................15-1
Figure 15-2 ZyWALL Web Configurator Welcome Screen..........................................................................15-2
Figure 15-3 Enabling the Firewall ................................................................................................................15-3
Figure 15-4 E-Mail Screen............................................................................................................................15-4
Figure 15-5 E-Mail Log................................................................................................................................15-7
Figure 15-6 Attack Alert...............................................................................................................................15-9
Figure 16-1 LAN to WAN Traffic ................................................................................................................16-3
Figure 16-2 WAN to LAN Traffic ................................................................................................................16-4
Figure 16-3 Firewall Rules Summary - First Screen ....................................................................................16-6
Figure 16-4 Creating/Editing A Firewall Rule .............................................................................................16-9
Figure 16-5 Adding/Editing Source & Destination Addresses ...................................................................16-11
Figure 16-6 Timeout Screen .......................................................................................................................16-12
Figure 17-1 Custom Ports .............................................................................................................................17-1
Figure 17-2 Creating/Editing A Custom Port ...............................................................................................17-3
Figure 18-1 Log Screen ................................................................................................................................18-1
Figure 19-1 Activate The Firewall................................................................................................................19-2
Figure 19-2 Example 1 - E-Mail Screen .......................................................................................................19-3
Figure 19-3 Example 1 - Configuring A Rule ..............................................................................................19-4
Figure 19-4 Example 1: Destination Address for Traffic Originating From The Internet ............................19-5
Figure 19-5 Example 1 - Rule Summary Screen ..........................................................................................19-6
Figure 19-6 Send Alerts When Attacked ......................................................................................................19-7
Figure 19-7 Configuring A POP Custom Port ..............................................................................................19-8
Figure 19-8 Example 2 - Local Network Rule 1 Configuration ...................................................................19-9