ZyXEL Communications ZyXEL ZyWALL 10W User manual

ZyWALL 10W/30W/50/100
Internet Security Gateway
User’s Guide
Version 3.62
January 2004

ZyWALL Series Internet Security Gateway
ii Copyright
Copyright
Copyright © 2004 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 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
1. Go to www.zyxel.com.
2. Select your product from the drop-down list box on the ZyXEL home page to go to that product's page.
3. Select the certification you wish to view from this page.

ZyWALL 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 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 your product online for free future product updates and information at www.zyxel.com for global
products, or at www.us.zyxel.com for North American products.

ZyWALL 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.zyxel.com
ftp.europe.zyxel.com
ZyXEL Communications Corp.,
6 Innovation Road II, Science-
Based Industrial Park, Hsinchu
300, Taiwan
[email protected]m [phone] www.us.zyxel.comNORTH
AMERICA
[e-mail] ftp.us.zyxel.com
ZyXEL Communications Inc.,
1130 N. Miller St.
Anaheim, CA 92806, 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/A2 D-52146
Wuerselen, Germany

ZyWALL 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 ............................................................................................................................................xv
List of Tables .......................................................................................................................................... xxiii
Preface ....................................................................................................................................................xxvii
Getting Started ................................................................................................................................................. I
Chapter 1 Getting to Know Your ZyWALL .......................................................................................... 1-1
1.1 ZyWALL Internet Security Gateway Overview ........................................................................ 1-1
1.2 ZyWALL Features ..................................................................................................................... 1-1
1.3 Applications for the ZyWALL................................................................................................... 1-9
Chapter 2 Introducing the Web Configurator ......................................................................................2-1
2.1 Web Configurator Overview...................................................................................................... 2-1
2.2 Accessing the ZyWALL Web Configurator............................................................................... 2-1
2.3 Resetting the ZyWALL.............................................................................................................. 2-2
2.4 Navigating the ZyWALL Web Configurator ............................................................................. 2-4
Chapter 3 Wizard Setup.......................................................................................................................... 3-1
3.1 Wizard Setup Overview ............................................................................................................. 3-1
3.2 Wizard Setup: General Setup and System Name ....................................................................... 3-1
3.3 Wizard Setup: Screen 2.............................................................................................................. 3-2
3.4 Wizard Setup: Screen 3.............................................................................................................. 3-8
3.5 Basic Setup Complete .............................................................................................................. 3-12
System, LAN and Wireless LAN....................................................................................................................II
Chapter 4 System Screens....................................................................................................................... 4-1
4.1 System Overview ....................................................................................................................... 4-1
4.2 DNS Overview........................................................................................................................... 4-1
4.3 Configuring General Setup......................................................................................................... 4-1
4.4 Dynamic DNS ............................................................................................................................ 4-3
4.5 Configuring Dynamic DNS........................................................................................................ 4-3
4.6 Configuring Password................................................................................................................ 4-5
4.7 Configuring Time Setting........................................................................................................... 4-6
Chapter 5 LAN Screens........................................................................................................................... 5-1
5.1 LAN Overview........................................................................................................................... 5-1
5.2 DHCP Setup............................................................................................................................... 5-1
5.3 LAN TCP/IP .............................................................................................................................. 5-1
5.4 Configuring IP............................................................................................................................ 5-3
5.5 Configuring Static DHCP........................................................................................................... 5-6

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viii Table of Contents
5.6 Configuring IP Alias...................................................................................................................5-7
Chapter 6 Wireless LAN Screens ............................................................................................................6-1
6.1 Wireless LAN Overview.............................................................................................................6-1
6.2 Wireless LAN Basics..................................................................................................................6-1
6.3 Wireless Security ........................................................................................................................6-3
6.4 Configuring Wireless LAN.........................................................................................................6-4
6.5 Configuring MAC Filter .............................................................................................................6-6
6.6 802.1x Overview.........................................................................................................................6-8
6.7 Configuring 802.1X ....................................................................................................................6-8
DMZ and WAN ............................................................................................................................................. III
Chapter 7 DMZ Screens...........................................................................................................................7-1
7.1 DMZ Overview...........................................................................................................................7-1
7.2 DMZ Addresses ..........................................................................................................................7-1
7.3 Configuring DMZ .......................................................................................................................7-1
Chapter 8 WAN Screens...........................................................................................................................8-1
8.1 WAN Overview ..........................................................................................................................8-1
8.2 TCP/IP Priority (Metric) .............................................................................................................8-1
8.3 Configuring Route ......................................................................................................................8-1
8.4 Configuring WAN ISP................................................................................................................8-2
8.5 Configuring WAN IP..................................................................................................................8-8
8.6 Configuring WAN MAC ..........................................................................................................8-11
8.7 Traffic Redirect.........................................................................................................................8-12
8.8 Configuring Traffic Redirect ....................................................................................................8-13
8.9 Configuring Dial Backup..........................................................................................................8-15
8.10 Advanced Modem Setup.......................................................................................................8-20
8.11 Configuring Advanced Modem Setup ..................................................................................8-21
NAT and Static Route ....................................................................................................................................IV
Chapter 9 Network Address Translation (NAT) Screens ......................................................................9-1
9.1 NAT Overview ...........................................................................................................................9-1
9.2 Using NAT..................................................................................................................................9-5
9.3 SUA Server.................................................................................................................................9-6
9.4 Configuring SUA Server.............................................................................................................9-8
9.5 Configuring Address Mapping..................................................................................................9-10
9.6 Trigger Port Forwarding ...........................................................................................................9-13
9.7 Configuring Trigger Port Forwarding.......................................................................................9-14
Chapter 10 Static Route Screens ...........................................................................................................10-1
10.1 Static Route Overview ..........................................................................................................10-1
10.2 Configuring IP Static Route..................................................................................................10-1
Firewall and Content Filtering ...................................................................................................................... V
Chapter 11 Firewalls .............................................................................................................................. 11-1
11.1 Firewall Overview ................................................................................................................11-1
11.2 Types of Firewalls.................................................................................................................11-1

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Table of Contents ix
11.3 Introduction to ZyXEL’s Firewall........................................................................................ 11-2
11.4 Denial of Service.................................................................................................................. 11-3
11.5 Stateful Inspection................................................................................................................ 11-7
11.6 Guidelines For Enhancing Security With Your Firewall ................................................... 11-11
11.7 Packet Filtering Vs Firewall............................................................................................... 11-12
Chapter 12 Firewall Screens ................................................................................................................. 12-1
12.1 Access Methods ................................................................................................................... 12-1
12.2 Firewall Policies Overview .................................................................................................. 12-1
12.3 Rule Logic Overview ........................................................................................................... 12-2
12.4 Connection Direction Examples........................................................................................... 12-4
12.5 Bandwidth Management - Lite............................................................................................. 12-5
12.6 Bandwidth Management Usage Examples........................................................................... 12-5
12.7 Alerts.................................................................................................................................... 12-7
12.8 Configuring Firewall............................................................................................................12-7
12.9 Example Firewall Rule....................................................................................................... 12-17
12.10 Predefined Services............................................................................................................ 12-21
12.11 Configuring Attack Alert ................................................................................................... 12-24
Chapter 13 Content Filtering Screens.................................................................................................. 13-1
13.1 Content Filtering Overview.................................................................................................. 13-1
13.2 General Content Filter Configuration................................................................................... 13-1
13.3 Content Filtering with an External Server............................................................................ 13-4
13.4 A Procedure to Enable External Database Content Filtering ............................................... 13-5
13.5 Configuring Categories ........................................................................................................ 13-6
13.6 Configuring Customization ................................................................................................ 13-13
VPN/IPSec ..................................................................................................................................................... VI
Chapter 14 Introduction to IPSec......................................................................................................... 14-1
14.1 VPN Overview ..................................................................................................................... 14-1
14.2 IPSec Architecture ............................................................................................................... 14-2
14.3 Encapsulation ....................................................................................................................... 14-3
14.4 IPSec and NAT .................................................................................................................... 14-4
Chapter 15 VPN Screens ....................................................................................................................... 15-1
15.1 VPN/IPSec Overview........................................................................................................... 15-1
15.2 IPSec Algorithms ................................................................................................................. 15-1
15.3 My IP Address...................................................................................................................... 15-2
15.4 Secure Gateway Address...................................................................................................... 15-2
15.5 VPN Rules Screen................................................................................................................15-3
15.6 Keep Alive ........................................................................................................................... 15-6
15.7 NAT Traversal ..................................................................................................................... 15-6
15.8 ID Type and Content............................................................................................................ 15-8
15.9 Pre-Shared Key ..................................................................................................................15-10
15.10 Certificates ......................................................................................................................... 15-10
15.11 Editing VPN Policies ......................................................................................................... 15-10

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x Table of Contents
15.12 IKE Phases..........................................................................................................................15-19
15.13 Configuring Advanced IKE Settings ..................................................................................15-21
15.14 Manual Key Setup...............................................................................................................15-24
15.15 Configuring Manual Key ....................................................................................................15-24
15.16 Viewing SA Monitor...........................................................................................................15-28
15.17 Configuring Global Setting.................................................................................................15-30
15.18 Telecommuter VPN/IPSec Examples .................................................................................15-31
15.19 VPN and Remote Management...........................................................................................15-34
Certificates ................................................................................................................................................... VII
Chapter 16 Certificates ..........................................................................................................................16-1
16.1 Certificates Overview ...........................................................................................................16-1
16.2 Self-signed Certificates.........................................................................................................16-2
16.3 Configuration Summary........................................................................................................16-2
16.4 My Certificates .....................................................................................................................16-3
16.5 Certificate File Formats ........................................................................................................16-6
16.6 Importing a Certificate..........................................................................................................16-7
16.7 Creating a Certificate ............................................................................................................16-8
16.8 My Certificate Details.........................................................................................................16-12
16.9 Trusted CAs ........................................................................................................................16-16
16.10 Importing a Trusted CA’s Certificate .................................................................................16-18
16.11 Trusted CA Certificate Details............................................................................................16-19
16.12 Trusted Remote Hosts.........................................................................................................16-23
16.13 Verifying a Trusted Remote Host’s Certificate...................................................................16-25
16.14 Importing a Trusted Remote Host’s Certificate ..................................................................16-27
16.15 Trusted Remote Host Certificate Details ............................................................................16-28
16.16 Directory Servers ................................................................................................................16-32
16.17 Add or Edit a Directory Server ...........................................................................................16-33
Authentication Server, Remote Management and UPnP ........................................................................VIII
Chapter 17 Authentication Server ........................................................................................................17-1
17.1 Authentication Server Overview...........................................................................................17-1
17.2 Local User Database .............................................................................................................17-1
17.3 Configuring Local User Database.........................................................................................17-1
17.4 Configuring RADIUS ...........................................................................................................17-5
Chapter 18 Remote Management Screens............................................................................................18-1
18.1 Remote Management Overview............................................................................................18-1
18.2 Introduction to HTTPS .........................................................................................................18-2
18.3 Configuring WWW...............................................................................................................18-4
18.4 HTTPS Login Example.........................................................................................................18-6
18.5 SSH Overview ....................................................................................................................18-14
18.6 How SSH works..................................................................................................................18-15
18.7 SSH Implementation on the ZyWALL ...............................................................................18-16
18.8 Configuring SSH.................................................................................................................18-16