ZyXEL Communications ZyXEL ZyWALL 10W User manual

ZyWALL 10/10W/50/100
Internet Security Gateway
User’s Guide
Versions 3.52 and 3.60
December 2002

ZyWALL 10~100 Series 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 10~100 Series 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 10~100 Series 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 10~100 Series 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 10~100 Series 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

ZyWALL 10~100 Series Internet Security Gateway
Table of Contents vii
Table of Contents
Copyright......................................................................................................................................................ii
Federal Communications Commission (FCC) Interference Statement................................................. iii
Information for Canadian Users ...............................................................................................................iv
ZyXEL Limited Warranty ..........................................................................................................................v
Customer Support ......................................................................................................................................vi
List of Figures ...........................................................................................................................................xvi
List of Tables ............................................................................................................................................xxv
Preface ......................................................................................................................................................xxx
Overview ........................................................................................................................................................... I
Chapter 1 Getting to Know Your ZyWALL .......................................................................................... 1-1
1.1 The ZyWALL 10/10W/50/100 Internet Security Gateway........................................................ 1-1
1.2 Features ...................................................................................................................................... 1-1
1.3 Applications for the ZyWALL................................................................................................... 1-7
Chapter 2 Hardware Installation ........................................................................................................... 2-1
2.1 Front Panel LEDs and Back Panel Ports .................................................................................... 2-1
2.2 ZyWALL Rear Panel and Connections...................................................................................... 2-3
2.3 Additional Installation Requirements......................................................................................... 2-8
2.4 Additional Installation Requirements for Using 802.1x............................................................. 2-9
Initial Setup and Configuration.....................................................................................................................II
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

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viii Table of Contents
4.1 System Name ..............................................................................................................................4-1
4.2 Dynamic DNS.............................................................................................................................4-1
4.3 General Setup..............................................................................................................................4-2
Chapter 5 WAN and Dial Backup Setup ................................................................................................5-1
5.1 Cloning The MAC Address ........................................................................................................5-1
5.2 WAN Setup.................................................................................................................................5-1
5.3 Dial Backup ................................................................................................................................5-2
5.4 Configuring Dial Backup in Menu 2...........................................................................................5-2
5.5 Advanced WAN Setup................................................................................................................5-4
5.6 Backup Remote Node Setup .......................................................................................................5-6
5.7 Remote Node Profile (Backup ISP) ............................................................................................5-7
5.8 Editing PPP Options ...................................................................................................................5-9
5.9 Editing TCP/IP Options ............................................................................................................5-11
5.10 Editing Login Script..............................................................................................................5-12
5.11 Remote Node Filter...............................................................................................................5-14
Chapter 6 LAN Setup...............................................................................................................................6-1
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 ...........................................................................................................................6-10
6.6 Wireless LAN Setup .................................................................................................................6-11
Chapter 7 Wireless LAN Security Setup ................................................................................................7-1
7.1 Levels of Security .......................................................................................................................7-1
7.2 Data Encryption with WEP.........................................................................................................7-1
7.3 Network Authentication..............................................................................................................7-3
7.4 Local User Authentication ..........................................................................................................7-8

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Table of Contents ix
7.5 MAC Address Filtering............................................................................................................ 7-10
Chapter 8 DMZ Setup ............................................................................................................................. 8-1
8.1 Introduction................................................................................................................................ 8-1
8.2 DMZ Port Filter Setup ............................................................................................................... 8-2
8.3 TCP/IP Setup.............................................................................................................................. 8-2
Chapter 9 Internet Access ....................................................................................................................... 9-1
9.1 Internet Access Setup................................................................................................................. 9-1
9.2 Basic Setup Complete ................................................................................................................ 9-5
Advanced Applications ................................................................................................................................. III
Chapter 10 Remote Node Setup............................................................................................................ 10-1
10.1 Remote Node Setup.............................................................................................................. 10-1
10.2 Remote Node Profile............................................................................................................ 10-2
10.3 Editing TCP/IP Options (with Ethernet Encapsulation)....................................................... 10-7
10.4 Remote Node Filter ............................................................................................................ 10-11
10.5 Traffic Redirect .................................................................................................................. 10-12
Chapter 11 IP Static Route Setup ..........................................................................................................11-1
11.1 IP Static Route Setup............................................................................................................ 11-2
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 ........................................................................................................................ IV
Chapter 13 Firewalls ............................................................................................................................. 13-1
13.1 What Is a Firewall? .............................................................................................................. 13-1

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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 Attack Alert...........................................................................................................................15-2
Chapter 16 Creating Custom Rules ......................................................................................................16-1
16.1 Rules Overview.....................................................................................................................16-1
16.2 Rule Logic Overview............................................................................................................16-2
16.3 Connection Direction Examples ...........................................................................................16-4
16.4 Rule Summary ......................................................................................................................16-5
16.5 Predefined Services...............................................................................................................16-8
16.6 Custom Ports.......................................................................................................................16-15
16.7 Creating/Editing A Custom Port .........................................................................................16-15
16.8 Example Firewall Rule .......................................................................................................16-17
Chapter 17 Content Filtering ................................................................................................................17-1
17.1 Categories .............................................................................................................................17-1
17.2 Free .......................................................................................................................................17-5
17.3 iCard .....................................................................................................................................17-7

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Table of Contents xi
17.4 List Update........................................................................................................................... 17-8
17.5 Exempt Computers............................................................................................................. 17-10
17.6 Customizing ....................................................................................................................... 17-11
17.7 Domain Name .................................................................................................................... 17-14
Logs, Filter Configuration, and SNMP Configuration ................................................................................V
Chapter 18 Centralized Logs ................................................................................................................ 18-1
18.1 View Log.............................................................................................................................. 18-1
18.2 Log Settings ......................................................................................................................... 18-3
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
20.3 SNMP Configuration............................................................................................................ 20-3
20.4 SNMP Traps......................................................................................................................... 20-4
System Information and Diagnosis and Firmware and Configuration File Maintenance...................... VI
Chapter 21 System Information & Diagnosis...................................................................................... 21-1
21.1 System Status ....................................................................................................................... 21-1
21.2 System Information and Console Port Speed....................................................................... 21-3
21.3 Log and Trace ...................................................................................................................... 21-5
21.4 Diagnostic .......................................................................................................................... 21-10
Chapter 22 Firmware and Configuration File Maintenance ............................................................. 22-1

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xii Table of Contents
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
System Maintenance and Information and Remote Management .......................................................... VII
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 Remote Management and the Firewall .................................................................................24-1
24.2 Telnet ....................................................................................................................................24-1
24.3 FTP .......................................................................................................................................24-2
24.4 Web.......................................................................................................................................24-2
24.5 SNMP ...................................................................................................................................24-2
24.6 DNS ......................................................................................................................................24-2
24.7 Remote Management ............................................................................................................24-2
24.8 Remote Management and NAT ............................................................................................24-4
24.9 System Timeout ....................................................................................................................24-5
Bandwidth Management ............................................................................................................................VIII
Chapter 25 Bandwidth Management....................................................................................................25-1
25.1 Introduction...........................................................................................................................25-1
25.2 Bandwidth Classes and Filters ..............................................................................................25-1
25.3 Proportional Bandwidth Allocation ......................................................................................25-2
25.4 Bandwidth Management Usage Examples............................................................................25-2
25.5 Scheduler ..............................................................................................................................25-4
25.6 Maximize Bandwidth Usage.................................................................................................25-5

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25.7 Bandwidth Borrowing.......................................................................................................... 25-8
25.8 Bandwidth Management Setup .......................................................................................... 25-10
IP Policy Routing, Call Scheduling and VPN/IPSec................................................................................... IX
Chapter 26 IP Policy Routing ............................................................................................................... 26-1
26.1 Introduction.......................................................................................................................... 26-1
26.2 Benefits ................................................................................................................................ 26-1
26.3 Routing Policy...................................................................................................................... 26-1
26.4 IP Routing Policy Setup ....................................................................................................... 26-2
26.5 Applying an IP Policy .......................................................................................................... 26-6
26.6 IP Policy Routing Example .................................................................................................. 26-7
Chapter 27 Call Scheduling .................................................................................................................. 27-1
27.1 Introduction.......................................................................................................................... 27-1
Chapter 28 Introduction to IPSec......................................................................................................... 28-1
28.1 Introduction.......................................................................................................................... 28-1
28.2 IPSec Architecture ............................................................................................................... 28-3
28.3 Encapsulation ....................................................................................................................... 28-5
28.4 IPSec and NAT .................................................................................................................... 28-5
Chapter 29 VPN/IPSec Setup ............................................................................................................... 29-1
29.1 VPN/IPSec Setup .................................................................................................................29-1
29.2 IPSec Algorithms ................................................................................................................. 29-2
29.3 IPSec Summary.................................................................................................................... 29-3
29.4 IPSec Setup ........................................................................................................................ 29-11
29.5 IKE Setup........................................................................................................................... 29-17
29.6 Manual Setup ..................................................................................................................... 29-21
Chapter 30 SA Monitor ......................................................................................................................... 30-1
30.1 Introduction.......................................................................................................................... 30-1
30.2 Using SA Monitor ................................................................................................................30-1

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xiv Table of Contents
Troubleshooting .............................................................................................................................................. X
Chapter 31 Troubleshooting ....................................................................................................................... 1
31.1 Problems Starting Up the ZyWALL .......................................................................................... 1
31.2 Problems with the LAN Interface .............................................................................................. 2
31.3 Problems with the DMZ Interface.............................................................................................. 2
31.4 Problems with the WAN Interface............................................................................................. 3
31.5 Problems with Internet Access...................................................................................................3
31.6 Problems with the Password ......................................................................................................4
31.7 Problems with Remote Management ......................................................................................... 4
General Appendices .......................................................................................................................................XI
Appendix A Setting up Your Computer’s IP Address............................................................................... 1
Appendix B Triangle Route ...................................................................................................................... 12
Appendix C The Big Picture..................................................................................................................... 15
Appendix D Wireless LAN and IEEE 802.11 .......................................................................................... 16
Appendix E Wireless LAN With IEEE 802.1x ........................................................................................20
Appendix F PPPoE .................................................................................................................................... 23
Appendix G PPTP ..................................................................................................................................... 25
Appendix H Hardware Specifications ..................................................................................................... 28
Appendix I Universal Plug and Play........................................................................................................ 33
Appendix J IP Subnetting ......................................................................................................................... 42
Appendix K Safety Warnings and Instructions ...................................................................................... 50
Appendix L Removing and Installing a ZyWALL 100 Fuse .................................................................. 51
Command and Log Appendices.................................................................................................................. XII
Appendix M Command Interpreter......................................................................................................... 55
Appendix N Firewall Commands............................................................................................................. 56
Appendix O NetBIOS Filter Commands................................................................................................. 63
Appendix P Boot Commands.................................................................................................................... 67

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Table of Contents xv
Appendix Q Log Descriptions...................................................................................................................69
Appendix R Brute-Force Password Guessing Protection.......................................................................87
Index............................................................................................................................................................ XIII
Index ............................................................................................................................................................A

ZyWALL 10~100 Series Internet Security Gateway
xvi List of Figures
List of Figures
Figure 1-1 Secure Internet Access via Cable, DSL or Wireless Modem.........................................................1-8
Figure 1-2 VPN Application ...........................................................................................................................1-9
Figure 2-1 ZyWALL 100 Front Panel.............................................................................................................2-1
Figure 2-2 ZyWALL 50 Front Panel...............................................................................................................2-1
Figure 2-3 ZyWALL 10W Front Panel ...........................................................................................................2-1
Figure 2-4 ZyWALL 10 Front Panel...............................................................................................................2-2
Figure 2-5 ZyWALL 100 Rear Panel..............................................................................................................2-4
Figure 2-6 ZyWALL 50 Rear Panel................................................................................................................2-4
Figure 2-7 ZyWALL 10W Rear Panel ............................................................................................................2-5
Figure 2-8 ZyWALL 10 Rear Panel................................................................................................................2-5
Figure 2-9 Inserting the Wireless LAN Card ..................................................................................................2-8
Figure 3-1 Initial Screen .................................................................................................................................3-1
Figure 3-2 Password Screen ...........................................................................................................................3-2
Figure 3-3 Main Menu (ZyWALL 100) ..........................................................................................................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 MAC Address Cloning in WAN Setup..........................................................................................5-1
Figure 5-2 Menu 2: Dial Backup Setup .........................................................................................................5-3
Figure 5-3 Menu 2.1 Advanced WAN Setup ..................................................................................................5-5
Figure 5-4 Menu 11.1 Remote Node Profile (Backup ISP) ............................................................................5-7
Figure 5-5 Menu 11.2 - Remote Node PPP Options .....................................................................................5-10

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List of Figures xvii
Figure 5-6 Remote Node PPP Options Menu Fields.................................................................................... 5-10
Figure 5-7 Menu 11.3: Remote Node Network Layer Options .....................................................................5-11
Figure 5-8 Menu 11.4 – Remote Node Setup Script .................................................................................... 5-14
Figure 5-9 Menu 11.5: Remote Node Filter (Ethernet) ................................................................................ 5-15
Figure 5-10 Menu 11.5: Remote Node Filter (PPPoE or PPTP) .................................................................. 5-15
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 RTS Threshold............................................................................................................................6-11
Figure 6-9 Menu 3.5 – Wireless LAN Setup................................................................................................ 6-12
Figure 7-1 ZyWALL Wireless Security Levels .............................................................................................. 7-1
Figure 7-2 Wireless LAN ............................................................................................................................... 7-2
Figure 7-3 Sequence for EAP Authentication ................................................................................................ 7-5
Figure 7-4 Wireless LAN 802.1X Authentication.......................................................................................... 7-6
Figure 7-5 Authentication RADIUS............................................................................................................... 7-7
Figure 7-6 Local User Database..................................................................................................................... 7-9
Figure 7-7 WLAN MAC Address Filter........................................................................................................7-11
Figure 8-1 Menu 5: DMZ Setup.................................................................................................................... 8-1
Figure 8-2 Menu 5.1: DMZ Port Filter Setup ................................................................................................ 8-2
Figure 8-3 Menu 5: TCP/IP Setup.................................................................................................................. 8-2
Figure 8-4 Menu 5.2: TCP/IP Setup............................................................................................................... 8-3
Figure 8-5 Menu 5.2.1: IP Alias Setup........................................................................................................... 8-4
Figure 9-1 Menu 4: Internet Access Setup (Ethernet) .................................................................................... 9-1

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xviii List of Figures
Figure 9-2 Internet Access Setup (PPTP) .......................................................................................................9-3
Figure 9-3 Internet Access Setup (PPPoE) .....................................................................................................9-4
Figure 10-1 Menu 11 Remote Node Setup ...................................................................................................10-1
Figure 10-2 Menu 11.1: Remote Node Profile for Ethernet Encapsulation ..................................................10-2
Figure 10-3 Menu 11.1: Remote Node Profile for PPPoE Encapsulation ....................................................10-4
Figure 10-4 Menu 11.1: Remote Node Profile for PPTP Encapsulation.......................................................10-6
Figure 10-5 Menu 11.3: Remote Node Network Layer Options for Ethernet Encapsulation .......................10-7
Figure 10-6 Menu 11.3: Remote Node Network Layer Options for PPTP Encapsulation............................10-9
Figure 10-7 Menu 11.5: Remote Node Filter (Ethernet Encapsulation) .....................................................10-11
Figure 10-8 Menu 11.5: Remote Node Filter (PPPoE or PPTP Encapsulation) .........................................10-12
Figure 10-9 Traffic Redirect WAN Setup ...................................................................................................10-12
Figure 10-10 Traffic Redirect LAN Setup ..................................................................................................10-13
Figure 10-11 Menu 11.1: Remote Node Profile..........................................................................................10-13
Figure 10-12 Menu 11.6: Traffic Redirect Setup ........................................................................................10-14
Figure 11-1 Example of Static Routing Topology ........................................................................................11-1
Figure 11-2 Menu 12: IP Static Route Setup (ZyWALL 10W).....................................................................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

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List of Figures xix
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 Trigger Port Forwarding Process: Example.......................................................................... 12-25
Figure 12-25 Menu 15.3—Trigger Port Setup ........................................................................................... 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 15-1 Enabling the Firewall (ZyWALL 100)...................................................................................... 15-2
Figure 15-2 Attack Alert .............................................................................................................................. 15-5
Figure 16-1 LAN to WAN Traffic................................................................................................................ 16-4
Figure 16-2 WAN to LAN Traffic................................................................................................................ 16-5
Figure 16-3 Firewall Rules Summary: First Screen (ZyWALL100)............................................................ 16-6

ZyWALL 10~100 Series Internet Security Gateway
xx List of Figures
Figure 16-4 Creating/Editing A Firewall Rule (ZyWALL100)...................................................................16-12
Figure 16-5 Adding/Editing Source and Destination Addresses.................................................................16-14
Figure 16-6 Creating/Editing A Custom Port..............................................................................................16-16
Figure 16-7 Firewall Rule Configuration Screen (ZyWALL100)...............................................................16-17
Figure 16-8 Firewall IP Config Screen .......................................................................................................16-18
Figure 16-9 Custom Port for MyService.....................................................................................................16-19
Figure 16-10 MyService Rule Configuration (ZyWALL100) ....................................................................16-20
Figure 16-11 Example 3: Rule Summary (ZyWALL100)...........................................................................16-21
Figure 17-1Content Filter: Categories ..........................................................................................................17-2
Figure 17-2 Content Filter: Free ...................................................................................................................17-6
Figure 17-3 Content Filter: iCard .................................................................................................................17-7
Figure 17-4 Content Filter: List Update........................................................................................................17-9
Figure 17-5 Content Filter: Exempt Zone...................................................................................................17-10
Figure 17-6 Content Filter: Customize .......................................................................................................17-12
Figure 17-7 Content Filter: Domain Name.................................................................................................17-14
Figure 18-1 View Log...................................................................................................................................18-2
Figure 18-2 Log Settings ..............................................................................................................................18-4
Figure 19-1 Outgoing Packet Filtering Process ............................................................................................19-2
Figure 19-2 Filter Rule Process ....................................................................................................................19-3
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