ZyXEL Communications Internet Security Gateway ZyWALL 100 User manual

ZyWALL 100
Internet Security Gateway
User’s Guide
Version 3.50
May 2002

ZyWALL 100 Internet Security Gateway
ii Copyright
Copyright
Copyright © 2002 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 100 Internet Security Gateway
FCC 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.
Certifications
Refer to the product page at www.zyxel.com.

ZyWALL 100 Internet Security Gateway
iv Information for 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 100 Internet Security Gateway
Warranty v
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 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. This warranty gives you specific legal rights, and you may also have other rights that vary from country
to country.
Online Registration
Register online registration at www.zyxel.com for free future product updates and information.

ZyWALL 100 Internet Security Gateway
vi Customer Support
Customer Support
When you contact your customer support representative please have the following information ready:
Please have the following information ready when you contact customer support.
• Product model and serial number.
• Information in Menu 24.2.1 – System Information.
• Warranty Information.
• Date that you received your device.
• Brief description of the problem and the steps you took to solve it.
METHOD
LOCATION
E-MAIL
SUPPORT/SALES
TELEPHONE/FAX WEB SITE/ FTP SITE REGULAR MAIL
[email protected]m.tw [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
300, Taiwan
[email protected]m [phone]
800-255-4101
www.zyxel.comNORTH
AMERICA
[e-mail] [phone] ftp.zyxel.com
ZyXEL Communications Inc.,
1650 Miraloma Avenue,
Placentia, CA 92870, U.S.A.
[email protected] [phone] www.zyxel.dkSCANDINAVIA
[e-mail] [phone] ftp.zyxel.dk
ZyXEL Communications A/S,
Columbusvej 5, 2860 Soeborg,
Denmark
[email protected] [phone] www.zyxel.deGERMANY
[e-mail] [phone]
ZyXEL Deutschland GmbH.
Adenauerstr. 20/A4 D-52146
Wuerselen, Germany
MALAYSIA [email protected] [phone] www.zyxel.com.my Lot B2-06, PJ Industrial Park,
Section 13, Jalan Kemajuan,
46200 Petaling Jaya Selangor
Darul Ehasn, Malaysia

ZyWALL 100 Internet Security Gateway
Table of Contents vii
Table of Contents
Getting Started ................................................................................................................................................. I
Chapter 1 Getting to Know Your ZyWALL .......................................................................................... 1-1
1.1 The ZyWALL 100 Internet Security Gateway........................................................................... 1-1
1.2 Physical Features of The ZyWALL 100 .................................................................................... 1-1
1.3 Non-Physical Features of The ZyWALL 100 ............................................................................ 1-2
1.4 Applications for the ZyWALL 100 ............................................................................................ 1-5
Chapter 2 Hardware Installation ........................................................................................................... 2-1
2.1 Front Panel LEDs and Back Panel Ports .................................................................................... 2-1
2.2 ZyWALL 100 Rear Panel and Connections............................................................................... 2-2
2.3 Additional Installation Requirements......................................................................................... 2-4
Chapter 3 Initial Setup............................................................................................................................ 3-1
3.1 Turning On Your ZyWALL....................................................................................................... 3-1
3.2 Navigating the SMT Interface....................................................................................................3-2
3.3 Changing the System Password ................................................................................................. 3-7
3.4 Resetting the ZyWALL.............................................................................................................. 3-8
Chapter 4 SMT Menu 1 - General Setup ............................................................................................... 4-1
4.1 System Name ............................................................................................................................. 4-1
4.2 Dynamic DNS ............................................................................................................................ 4-1
4.3 General Setup............................................................................................................................. 4-2
Chapter 5 WAN Setup ............................................................................................................................. 5-1
5.1 Cloning The MAC Address........................................................................................................ 5-1
5.2 Dial-Backup ............................................................................................................................... 5-1
5.3 WAN Setup ................................................................................................................................ 5-1
5.4 Advanced WAN Setup............................................................................................................... 5-3
Chapter 6 LAN Setup.............................................................................................................................. 6-1

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viii Table of Contents
6.1 Introduction.................................................................................................................................6-1
6.2 LAN Port Filter Setup.................................................................................................................6-1
6.3 TCP/IP and LAN DHCP.............................................................................................................6-2
6.4 TCP/IP and DHCP Ethernet Setup Menu ...................................................................................6-5
6.5 Wireless LAN Setup .................................................................................................................6-10
Chapter 7 DMZ Setup..............................................................................................................................7-1
7.1 Introduction.................................................................................................................................7-1
7.2 DMZ Port Filter Setup ................................................................................................................7-1
7.3 TCP/IP Setup ..............................................................................................................................7-2
Chapter 8 Internet Access........................................................................................................................8-1
8.1 Internet Access Setup..................................................................................................................8-1
8.2 Basic Setup Complete .................................................................................................................8-5
Advanced Applications...................................................................................................................................II
Chapter 9 Remote Node Setup ................................................................................................................9-1
9.1 Remote Node Setup ....................................................................................................................9-1
9.2 Remote Node Profile...................................................................................................................9-2
9.3 Editing TCP/IP Options (with Ethernet Encapsulation)..............................................................9-8
9.4 Remote Node Filter...................................................................................................................9-12
9.5 Traffic Redirect.........................................................................................................................9-13
Chapter 10 Backup Remote Node Setup ..............................................................................................10-1
10.1 Remote Node Profile (Backup ISP) ......................................................................................10-1
10.2 Editing PPP Options .............................................................................................................10-3
10.3 Editing TCP/IP Options ........................................................................................................10-5
10.4 Editing Login Script..............................................................................................................10-6
10.5 Remote Node Filter...............................................................................................................10-8
Chapter 11 IP Static Route Setup.......................................................................................................... 11-1
11.1 IP Static Route Setup ............................................................................................................11-2

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Table of Contents ix
Chapter 12 Network Address Translation (NAT) ............................................................................... 12-1
12.1 Introduction.......................................................................................................................... 12-1
12.2 Using NAT........................................................................................................................... 12-6
12.3 NAT Setup ........................................................................................................................... 12-8
12.4 NAT Server Sets – Port Forwarding .................................................................................. 12-14
12.5 General NAT Examples ..................................................................................................... 12-17
12.6 Trigger Port Forwarding..................................................................................................... 12-24
Firewall and Content Filters ........................................................................................................................ III
Chapter 13 Firewalls ............................................................................................................................. 13-1
13.1 What Is a Firewall? .............................................................................................................. 13-1
13.2 Types of Firewalls................................................................................................................ 13-1
13.3 Introduction to ZyXEL’s Firewall........................................................................................ 13-2
13.4 Denial of Service.................................................................................................................. 13-3
13.5 Stateful Inspection................................................................................................................ 13-7
13.6 Guidelines For Enhancing Security With Your Firewall ................................................... 13-11
13.7 Packet Filtering Vs Firewall............................................................................................... 13-12
Chapter 14 Introducing the ZyWALL Firewall .................................................................................. 14-1
14.1 Remote Management and the Firewall................................................................................. 14-1
14.2 Access Methods ................................................................................................................... 14-1
14.3 Using ZyWALL SMT Menus .............................................................................................. 14-1
Chapter 15 Using the ZyWALL Web Configurator............................................................................ 15-1
15.1 Web Configurator Login and Main Menu Screens .............................................................. 15-1
15.2 Enabling the Firewall ...........................................................................................................15-1
15.3 E-mail................................................................................................................................... 15-2
15.4 Attack Alert.......................................................................................................................... 15-6
Chapter 16 Creating Custom Rules ..................................................................................................... 16-1
16.1 Rules Overview.................................................................................................................... 16-1

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x Table of Contents
16.2 Rule Logic Overview............................................................................................................16-2
16.3 Connection Direction Examples ...........................................................................................16-3
16.4 Rule Summary ......................................................................................................................16-5
16.5 Predefined Services...............................................................................................................16-7
16.6 Custom Ports.......................................................................................................................16-14
16.7 Creating/Editing A Custom Port .........................................................................................16-14
16.8 Example Firewall Rule .......................................................................................................16-16
Chapter 17 Logs......................................................................................................................................17-1
17.1 Log Screen ............................................................................................................................17-1
Chapter 18 Content Filtering ................................................................................................................18-1
18.1 Categories .............................................................................................................................18-1
18.2 List Update............................................................................................................................18-1
18.3 Exempt Computers................................................................................................................18-1
18.4 Customizing ..........................................................................................................................18-2
18.5 Keywords..............................................................................................................................18-2
18.6 Logs ......................................................................................................................................18-2
Advanced Management.................................................................................................................................IV
Chapter 19 Filter Configuration ...........................................................................................................19-1
19.1 About Filtering......................................................................................................................19-1
19.2 Configuring a Filter Set ........................................................................................................19-4
19.3 Example Filter.....................................................................................................................19-13
19.4 Filter Types and NAT .........................................................................................................19-16
19.5 Firewall ...............................................................................................................................19-16
19.6 Applying a Filter and Factory Defaults...............................................................................19-17
Chapter 20 SNMP Configuration..........................................................................................................20-1
20.1 About SNMP.........................................................................................................................20-1
20.2 Supported MIBs....................................................................................................................20-3

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Table of Contents xi
20.3 SNMP Configuration............................................................................................................ 20-3
20.4 SNMP Traps......................................................................................................................... 20-4
Chapter 21 System Information & Diagnosis...................................................................................... 21-5
21.1 System Status ....................................................................................................................... 21-5
21.2 System Information and Console Port Speed....................................................................... 21-7
21.3 Log and Trace ...................................................................................................................... 21-9
21.4 Diagnostic .......................................................................................................................... 21-14
Chapter 22 Firmware and Configuration File Maintenance ............................................................. 22-1
22.1 Filename Conventions.......................................................................................................... 22-1
22.2 Backup Configuration .......................................................................................................... 22-2
22.3 Restore Configuration .......................................................................................................... 22-8
22.4 Uploading Firmware and Configuration Files.................................................................... 22-11
Chapter 23 System Maintenance & Information................................................................................ 23-1
23.1 Command Interpreter Mode................................................................................................. 23-1
23.2 Call Control Support ............................................................................................................23-2
23.3 Time and Date Setting.......................................................................................................... 23-5
Chapter 24 Remote Management......................................................................................................... 24-1
24.1 Telnet ................................................................................................................................... 24-1
24.2 FTP....................................................................................................................................... 24-1
24.3 Web ...................................................................................................................................... 24-2
24.4 SNMP................................................................................................................................... 24-2
24.5 DNS...................................................................................................................................... 24-2
24.6 Remote Management............................................................................................................ 24-2
24.7 Remote Management and NAT............................................................................................ 24-4
24.8 System Timeout ................................................................................................................... 24-4
IP Policy Routing, Call Scheduling and VPN/IPSec.....................................................................................V
Chapter 25 IP Policy Routing ............................................................................................................... 25-1

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xii Table of Contents
25.1 Introduction...........................................................................................................................25-1
25.2 Benefits .................................................................................................................................25-1
25.3 Routing Policy ......................................................................................................................25-1
25.4 IP Routing Policy Setup........................................................................................................25-2
25.5 Applying an IP Policy...........................................................................................................25-6
25.6 IP Policy Routing Example...................................................................................................25-6
Chapter 26 Call Scheduling...................................................................................................................26-1
26.1 Introduction...........................................................................................................................26-1
Chapter 27 Introduction to IPSec .........................................................................................................27-1
27.1 Introduction...........................................................................................................................27-1
27.2 IPSec Architecture ................................................................................................................27-3
27.3 Encapsulation........................................................................................................................27-5
27.4 IPSec and NAT .....................................................................................................................27-5
Chapter 28 VPN/IPSec Setup ................................................................................................................28-1
28.1 VPN/IPSec Setup..................................................................................................................28-1
28.2 IPSec Algorithms ..................................................................................................................28-2
28.3 IPSec Summary.....................................................................................................................28-3
28.4 IPSec Setup ...........................................................................................................................28-9
28.5 IKE Setup............................................................................................................................28-12
28.6 Manual Setup ......................................................................................................................28-17
Chapter 29 SA Monitor..........................................................................................................................29-1
29.1 Introduction...........................................................................................................................29-1
29.2 Using SA Monitor.................................................................................................................29-1
Chapter 30 IPSec Log ............................................................................................................................30-1
30.1 VPN Initiator IPSec Log.......................................................................................................30-1
30.2 VPN Responder IPSec Log...................................................................................................30-2
Troubleshooting, Appendices and Index ...................................................................................................31-1

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Table of Contents xiii
Chapter 31 Troubleshooting ................................................................................................................. 31-1
31.1 Problems Starting Up the ZyWALL .................................................................................... 31-1
31.2 Problems with the LAN Interface ........................................................................................ 31-2
31.3 Problems with the DMZ Interface........................................................................................ 31-2
31.4 Problems with the WAN Interface ....................................................................................... 31-3
31.5 Problems with Internet Access............................................................................................. 31-3
31.6 Problems with the Password ................................................................................................ 31-4
31.7 Problems with Remote Management ................................................................................... 31-4

ZyWALL 100 Internet Security Gateway
xiv List of Figures
List of Figures
Figure 1-1 Secure Internet Access via Cable, DSL or Wireless Modem.........................................................1-6
Figure 1-2 VPN Application ...........................................................................................................................1-7
Figure 2-1 Front Panel ....................................................................................................................................2-1
Figure 2-2 ZyWALL 100 Rear Panel..............................................................................................................2-3
Figure 2-3 LAN Port Connections..................................................................................................................2-4
Figure 3-1 Initial Screen .................................................................................................................................3-1
Figure 3-2 Password Screen ...........................................................................................................................3-2
Figure 3-3 ZyWALL Main Menu....................................................................................................................3-3
Figure 3-4 Getting Started and Advanced Applications SMT Menus.............................................................3-5
Figure 3-5 Advanced Management SMT Menus ............................................................................................3-6
Figure 3-6 Schedule Setup and IPSec VPN Configuration SMT Menus........................................................3-7
Figure 3-7 Menu 23 — System Password ......................................................................................................3-7
Figure 4-1 Menu 1 — General Setup..............................................................................................................4-2
Figure 4-2 Configure Dynamic DNS..............................................................................................................4-3
Figure 5-1 Menu 2 — WAN Setup .................................................................................................................5-2
Figure 5-2 Menu 2.1 Advanced WAN Setup ..................................................................................................5-4
Figure 6-1 Menu 3 — LAN Setup ..................................................................................................................6-1
Figure 6-2 Menu 3.1 — LAN Port Filter Setup..............................................................................................6-2
Figure 6-3 Physical Network ..........................................................................................................................6-5
Figure 6-4 Partitioned Logical Networks .......................................................................................................6-5
Figure 6-5 Menu 3 — TCP/IP and DHCP Setup ............................................................................................6-6
Figure 6-6 Menu 3.2 — TCP/IP and DHCP Ethernet Setup...........................................................................6-6
Figure 6-7 Menu 3.2.1 — IP Alias Setup........................................................................................................6-9
Figure 6-8 Menu 3.5 – Wireless LAN Setup ................................................................................................6-10
Figure 6-9 Menu 3.5.1 - WLAN MAC Address Filter..................................................................................6-13

ZyWALL 100 Internet Security Gateway
List of Figures xv
Figure 7-1 Menu 5 — DMZ Setup................................................................................................................ 7-1
Figure 7-2 Menu 5.1 — DMZ Port Filter Setup............................................................................................. 7-2
Figure 7-3 Menu 5 — TCP/IP Setup.............................................................................................................. 7-2
Figure 7-4 Menu 5.2 — TCP/IP Setup........................................................................................................... 7-3
Figure 7-5 Menu 5.2.1 — IP Alias Setup ....................................................................................................... 7-4
Figure 8-1 Menu 4 — Internet Access Setup (Ethernet) ................................................................................ 8-1
Figure 8-2 Internet Access Setup (PPTP)....................................................................................................... 8-3
Figure 8-3 Internet Access Setup (PPPoE)..................................................................................................... 8-4
Figure 9-1 Menu 11 Remote Node Setup....................................................................................................... 9-1
Figure 9-2 Menu 11.1 — Remote Node Profile for Ethernet Encapsulation ................................................. 9-2
Figure 9-3 Menu 11.1 — Remote Node Profile for PPPoE Encapsulation.................................................... 9-4
Figure 9-4 Menu 11.1 — Remote Node Profile for PPTP Encapsulation ...................................................... 9-7
Figure 9-5 Menu 11.3 — Remote Node Network Layer Options for Ethernet Encapsulation....................... 9-8
Figure 9-6 Menu 11.3 — Remote Node Network Layer Options for PPTP Encapsulation ......................... 9-10
Figure 9-7 Menu 11.5 — Remote Node Filter (Ethernet Encapsulation)..................................................... 9-12
Figure 9-8 Menu 11.5 — Remote Node Filter (PPPoE or PPTP Encapsulation)......................................... 9-12
Figure 9-9 Traffic Redirect WAN Setup....................................................................................................... 9-13
Figure 9-10 Traffic Redirect LAN Setup ..................................................................................................... 9-14
Figure 9-11 Menu 11.1 — Remote Node Profile ......................................................................................... 9-14
Figure 9-12 Menu 11.6 — Traffic Redirect Setup........................................................................................ 9-15
Figure 10-1 Menu 11.1 Remote Node Profile (Backup ISP)........................................................................ 10-1
Figure 10-2 Menu 11.2 - Remote Node PPP Options .................................................................................. 10-4
Figure 10-3 Remote Node PPP Options Menu Fields.................................................................................. 10-4
Figure 10-4 Menu 11.3 — Remote Node Network Layer Options .............................................................. 10-5
Figure 10-5 Menu 11.4 – Remote Node Setup Script .................................................................................. 10-8
Figure 10-6 Menu 11.5 — Remote Node Filter (Ethernet) .......................................................................... 10-9
Figure 10-7 Menu 11.5 — Remote Node Filter (PPPoE or PPTP) .............................................................. 10-9

ZyWALL 100 Internet Security Gateway
xvi List of Figures
Figure 11-1 Example of Static Routing Topology ........................................................................................11-1
Figure 11-2 Menu 12 — IP Static Route Setup.............................................................................................11-2
Figure 11-3 Menu 12. 1 — Edit IP Static Route ...........................................................................................11-3
Figure 12-1 How NAT Works .......................................................................................................................12-3
Figure 12-2 NAT Application With IP Alias .................................................................................................12-4
Figure 12-3 Menu 4 — Applying NAT for Internet Access..........................................................................12-7
Figure 12-4 Menu 11.3 — Applying NAT to the Remote Node ...................................................................12-8
Figure 12-5 Menu 15 — NAT Setup.............................................................................................................12-9
Figure 12-6 Menu 15.1 — Address Mapping Sets........................................................................................12-9
Figure 12-7 Menu 15.1.255 — SUA Address Mapping Rules....................................................................12-10
Figure 12-8 Menu 15.1.1 — First Set ......................................................................................................... 12-11
Figure 12-9 Menu 15.1.1.1 — Editing/Configuring an Individual Rule in a Set........................................12-13
Figure 12-10 Menu 15.2 — NAT Server Setup ..........................................................................................12-16
Figure 12-11 Multiple Servers Behind NAT Example................................................................................12-16
Figure 12-12 NAT Example 1.....................................................................................................................12-17
Figure 12-13 Menu 4 — Internet Access & NAT Example ........................................................................12-17
Figure 12-14 NAT Example 2.....................................................................................................................12-18
Figure 12-15 Menu 15.2 — Specifying an Inside Server ...........................................................................12-19
Figure 12-16 NAT Example 3.....................................................................................................................12-20
Figure 12-17 Example 3: Menu 11.3 ..........................................................................................................12-21
Figure 12-18 Example 3: Menu 15.1.1.1 ....................................................................................................12-21
Figure 12-19 Example 3: Final Menu 15.1.1 ..............................................................................................12-22
Figure 12-20 Example 3: Menu 15.2 ..........................................................................................................12-22
Figure 12-21 NAT Example 4.....................................................................................................................12-23
Figure 12-22 Example 4: Menu 15.1.1.1 — Address Mapping Rule..........................................................12-24
Figure 12-23 Example 4: Menu 15.1.1 — Address Mapping Rules ...........................................................12-24
Figure 12-24 Menu 15.3—Trigger Port Setup............................................................................................12-25

ZyWALL 100 Internet Security Gateway
List of Figures xvii
Figure 12-25 Trigger Port Forwarding Process — Example...................................................................... 12-26
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.................................................................................................................... 13-8
Figure 14-1 Menu 21 — Filter and Firewall Setup ...................................................................................... 14-1
Figure 14-2 Menu 21.2 — Firewall Setup ................................................................................................... 14-2
Figure 14-3 Example Firewall Log .............................................................................................................. 14-2
Figure 15-1 Enabling the Firewall ............................................................................................................... 15-2
Figure 15-2 E-mail Screen ........................................................................................................................... 15-3
Figure 15-3 E-mail Log................................................................................................................................ 15-6
Figure 15-4 Attack Alert .............................................................................................................................. 15-8
Figure 16-1 LAN to WAN Traffic................................................................................................................ 16-4
Figure 16-2 WAN to LAN Traffic................................................................................................................ 16-4
Figure 16-3 Firewall Rules Summary — First Screen ................................................................................. 16-5
Figure 16-4 Creating/Editing A Firewall Rule ............................................................................................16-11
Figure 16-5 Adding/Editing Source and Destination Addresses ................................................................ 16-13
Figure 16-6 Creating/Editing A Custom Port............................................................................................. 16-15
Figure 16-7 Firewall Rule Configuration Screen ....................................................................................... 16-16
Figure 16-8 Firewall IP Config Screen ...................................................................................................... 16-17
Figure 16-9 Custom Port for Syslog .......................................................................................................... 16-18
Figure 16-10 Syslog Rule Configuration ................................................................................................... 16-19
Figure 16-11 Example 3: Rule Summary................................................................................................... 16-20
Figure 17-1 Log Screen................................................................................................................................ 17-1
Figure 19-1 Outgoing Packet Filtering Process ........................................................................................... 19-2
Figure 19-2 Filter Rule Process.................................................................................................................... 19-3

ZyWALL 100 Internet Security Gateway
xviii List of Figures
Figure 19-4 Menu 21 — Filter and Firewall Setup.......................................................................................19-4
Figure 19-5 Menu 21.1 — Filter Set Configuration .....................................................................................19-4
Figure 19-6 Menu 21.1.1.1 — TCP/IP Filter Rule........................................................................................19-7
Figure 19-7 Executing an IP Filter..............................................................................................................19-10
Figure 19-8 Menu 21.1.4.1 — Generic Filter Rule.....................................................................................19-11
Figure 19-9 Telnet Filter Example ..............................................................................................................19-13
Figure 19-10 Example Filter — Menu 21.1.3.1..........................................................................................19-14
Figure 19-11 Example Filter Rules Summary — Menu 21.1.3 ..................................................................19-15
Figure 19-12 Protocol and Device Filter Sets.............................................................................................19-16
Figure 19-13 Filtering LAN Traffic............................................................................................................19-17
Figure 19-14Filtering DMZ Traffic ............................................................................................................19-18
Figure 19-15 Filtering Remote Node Traffic ..............................................................................................19-18
Figure 20-1 SNMP Management Model.......................................................................................................20-2
Figure 20-2 Menu 22 — SNMP Configuration ............................................................................................20-3
Figure 21-1 Menu 24 — System Maintenance .............................................................................................21-5
Figure 21-2 Menu 24.1 — System Maintenance — Status...........................................................................21-6
Figure 21-3 Menu 24.2 — System Information and Console Port Speed.....................................................21-7
Figure 21-4 Menu 24.2.1 — System Maintenance — Information .............................................................21-8
Figure 21-5 Menu 24.2.2 — System Maintenance — Change Console Port Speed ....................................21-9
Figure 21-6 Menu 24.3 — System Maintenance — Log and Trace ...........................................................21-10
Figure 21-7 Examples of Error and Information Messages ........................................................................21-10
Figure 21-8 Menu 24.3.2 — System Maintenance — UNIX Syslog .........................................................21-11
Figure 21-9 Call-Triggering Packet Example .............................................................................................21-14
Figure 21-10 Menu 24.4 — System Maintenance — Diagnostic ...............................................................21-15
Figure 21-11 WAN & LAN DHCP.............................................................................................................21-16
Figure 22-1 Telnet into Menu 24.5 ...............................................................................................................22-3
Figure 22-2 FTP Session Example................................................................................................................22-4

ZyWALL 100 Internet Security Gateway
List of Figures xix
Figure 22-3 System Maintenance — Backup Configuration ....................................................................... 22-7
Figure 22-4 System Maintenance — Starting Xmodem Download Screen ................................................. 22-7
Figure 22-5 Backup Configuration Example ............................................................................................... 22-7
Figure 22-6 Successful Backup Confirmation Screen.................................................................................. 22-7
Figure 22-7 Telnet into Menu 24.6............................................................................................................... 22-9
Figure 22-8 Restore Using FTP Session Example ..................................................................................... 22-10
Figure 22-9 System Maintenance — Restore Configuration ..................................................................... 22-10
Figure 22-10 System Maintenance — Starting Xmodem Download Screen ............................................. 22-10
Figure 22-11 Restore Configuration Example ............................................................................................22-11
Figure 22-12 Successful Restoration Confirmation Screen ........................................................................22-11
Figure 22-13 Telnet Into Menu 24.7.1 — Upload System Firmware......................................................... 22-12
Figure 22-14 Telnet Into Menu 24.7.2 — System Maintenance ................................................................ 22-13
Figure 22-15 FTP Session Example of Firmware File Upload .................................................................. 22-14
Figure 22-16 Menu 24.7.1 as seen using the Console Port ........................................................................ 22-16
Figure 22-17 Example Xmodem Upload ................................................................................................... 22-17
Figure 22-18 Menu 24.7.2 as seen using the Console Port ........................................................................ 22-18
Figure 22-19 Example Xmodem Upload ................................................................................................... 22-19
Figure 23-1 Command Mode in Menu 24.................................................................................................... 23-1
Figure 23-2 Valid Commands ...................................................................................................................... 23-2
Figure 23-3 Call Control .............................................................................................................................. 23-2
Figure 23-4 Budget Management................................................................................................................. 23-3
Figure 23-5 Call History .............................................................................................................................. 23-4
Figure 23-6 Menu 24 — System Maintenance ............................................................................................ 23-5
Figure 23-7 Menu 24.10 System Maintenance — Time and Date Setting................................................... 23-6
Figure 24-1 Telnet Configuration on a TCP/IP Network ............................................................................. 24-1
Figure 24-2 Menu 24.11 – Remote Management Control............................................................................ 24-3
Figure 25-2 IP Routing Policy Setup ........................................................................................................... 25-2

ZyWALL 100 Internet Security Gateway
xx List of Figures
Figure 25-4 Menu 25.1 — Sample IP Routing Policy Setup ........................................................................25-3
Figure 25-5 IP Routing Policy ......................................................................................................................25-4
Figure 25-6 Menu 3.2 — TCP/IP and DHCP Ethernet Setup .......................................................................25-6
Figure 25-7 Example of IP Policy Routing...................................................................................................25-7
Figure 25-8 IP Routing Policy Example .......................................................................................................25-8
Figure 25-9 IP Routing Policy ......................................................................................................................25-9
Figure 25-10 Applying IP Policies..............................................................................................................25-10
Figure 26-1 Menu 26 - Schedule Setup ........................................................................................................26-1
Figure 26-2 Schedule Set Setup....................................................................................................................26-2
Figure 26-3 Applying Schedule Set(s) to a Remote Node (PPPoE)..............................................................26-4
Figure 26-4 Applying Schedule Set(s) to a Remote Node (PPTP) ...............................................................26-4
Figure 27-1 Encryption and Decryption .......................................................................................................27-2
Figure 27-2 VPN Application .......................................................................................................................27-3
Figure 27-3 IPSec Architecture.....................................................................................................................27-4
Figure 27-4 Transport and Tunnel Mode IPSec Encapsulation.....................................................................27-5
Figure 28-1 VPN SMT Menu Tree ...............................................................................................................28-1
Figure 28-2 Menu 27 — VPN/IPSec Setup ..................................................................................................28-2
Figure 28-3 IPSec Summary Fields ..............................................................................................................28-3
Figure 28-4 Telecommuter’s ZyWALL Configuration .................................................................................28-5
Figure 28-5 Headquarters ZyWALL Configuration......................................................................................28-5
Figure 28-6 Menu 27.1 — IPSec Summary..................................................................................................28-6
Figure 28-7 Menu 27.1.1 — IPSec Setup .....................................................................................................28-9
Figure 28-8 Two Phases to set up the IPSec SA .........................................................................................28-13
Figure 28-9 Menu 27.1.1.1 —IKE Setup.......................................................................................................28-15
Figure 28-10 Menu 27.1.1.2 — Manual Setup ...........................................................................................28-18
Figure 29-1 Menu 27.2 — SA Monitor ........................................................................................................29-1
Figure 30-1 Example VPN Initiator IPSec Log ............................................................................................30-1