ZyXEL Communications ZyWALL 10 User manual

ZyWALL
10/10W/30W/50/100
Internet Security Gateway
User’s Guide
Versions 3.52 and 3.61
June 2003

ZyWALL 10~100 Series Internet Security Gateway
ii Copyright
Copyright
Copyright © 2003 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/A2 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 ........................................................................................................................................ xviii
List of Tables ............................................................................................................................................xxv
Preface .....................................................................................................................................................xxix
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 ..................................................................................................................... 1-2
1.3 Applications for the ZyWALL................................................................................................... 1-8
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 ............................................................................. 2-3
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

ZyWALL 10~100 Series Internet Security Gateway
viii Table of Contents
Chapter 4 System Screens........................................................................................................................4-1
4.1 System Overview........................................................................................................................4-1
4.2 Configuring General Setup .........................................................................................................4-1
4.3 Dynamic DNS.............................................................................................................................4-2
4.4 Configuring Dynamic DNS ........................................................................................................4-2
4.5 Configuring Password.................................................................................................................4-4
4.6 Configuring Time Zone ..............................................................................................................4-5
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 ...........................................................................................................5-5
5.6 Configuring IP Alias...................................................................................................................5-6
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 RADIUS .....................................................................................................................................6-8
6.8 Local User Database .................................................................................................................6-10
6.9 Configuring 802.1X ..................................................................................................................6-10
6.10 Configuring Local User Database.........................................................................................6-11
6.11 Configuring RADIUS ...........................................................................................................6-13
DMZ and WAN ............................................................................................................................................. III

ZyWALL 10~100 Series Internet Security Gateway
Table of Contents ix
Chapter 7 DMZ Screens.......................................................................................................................... 7-1
7.1 DMZ Overview .......................................................................................................................... 7-1
7.2 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 ............................................................................................................... 8-10
8.6 Configuring WAN MAC.......................................................................................................... 8-13
8.7 Traffic Redirect ........................................................................................................................ 8-14
8.8 Configuring Traffic Redirect....................................................................................................8-15
8.9 Configuring Dial Backup .........................................................................................................8-16
8.10 Advanced Modem Setup ...................................................................................................... 8-21
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................................................................................................................................. 9-6
9.3 SUA Server ................................................................................................................................ 9-6
9.4 Configuring SUA Server............................................................................................................ 9-8
9.5 Configuring Address Mapping................................................................................................. 9-10
9.6 Configuring Trigger Port.......................................................................................................... 9-13
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 Filters ..........................................................................................................................V

ZyWALL 10~100 Series Internet Security Gateway
x Table of Contents
Chapter 11 Firewalls .............................................................................................................................. 11-1
11.1 Firewall Overview ................................................................................................................11-1
11.2 Types of Firewalls.................................................................................................................11-1
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 Configuring Firewall.............................................................................................................12-5
12.6 Example Firewall Rule .......................................................................................................12-12
12.7 Predefined Services.............................................................................................................12-17
12.8 Alerts...................................................................................................................................12-19
12.9 Configuring Attack Alert ....................................................................................................12-20
Chapter 13 Content Filtering Screens ..................................................................................................13-1
13.1 Content Filtering Overview ..................................................................................................13-1
13.2 Configuring Categories.........................................................................................................13-1
13.3 Configuring Free...................................................................................................................13-5
13.4 Configuring iCard .................................................................................................................13-7
13.5 Configuring List Update .......................................................................................................13-8
13.6 Configuring Exempt Computers ...........................................................................................13-9
13.7 Configuring Customize.......................................................................................................13-11
13.8 Configuring Keyword Blocking..........................................................................................13-14