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Table of Contents
ZyWALL 2WG User’s Guide
25
Chapter 37
IP Static Route Setup............................................................................................................591
37.1 IP Static Route Setup ...................................................................................................... 591
Chapter 38
Network Address Translation (NAT)....................................................................................595
38.1 Using NAT ........................................................................................................................ 595
38.1.1 SUA (Single User Account) Versus NAT ................................................................ 595
38.1.2 Applying NAT ......................................................................................................... 595
38.2 NAT Setup ....................................................................................................................... 597
38.2.1 Address Mapping Sets ........................................................................................... 598
38.3 Configuring a Server behind NAT .................................................................................... 602
38.4 General NAT Examples ................................................................................................... 605
38.4.1 Internet Access Only .............................................................................................. 605
38.4.2 Example 2: Internet Access with a Default Server ................................................. 606
38.4.3 Example 3: Multiple Public IP Addresses With Inside Servers .............................. 607
38.4.4 Example 4: NAT Unfriendly Application Programs ................................................. 610
38.5 Trigger Port Forwarding ...................................................................................................612
38.5.1 Two Points To Remember About Trigger Ports ...................................................... 612
Chapter 39
Introducing the ZyWALL Firewall........................................................................................615
39.1 Using ZyWALL SMT Menus ............................................................................................ 615
39.1.1 Activating the Firewall ............................................................................................ 615
Chapter 40
Filter Configuration...............................................................................................................617
40.1 Introduction to Filters ....................................................................................................... 617
40.1.1 The Filter Structure of the ZyWALL ........................................................................ 618
40.2 Configuring a Filter Set .................................................................................................... 620
40.2.1 Configuring a Filter Rule ........................................................................................ 621
40.2.2 Configuring a TCP/IP Filter Rule ............................................................................ 622
40.2.3 Configuring a Generic Filter Rule ........................................................................... 624
40.3 Example Filter .................................................................................................................. 626
40.4 Filter Types and NAT ....................................................................................................... 628
40.5 Firewall Versus Filters ..................................................................................................... 628
40.5.1 Packet Filtering: ..................................................................................................... 628
40.5.2 Firewall ................................................................................................................... 629
40.6 Applying a Filter .............................................................................................................. 629
40.6.1 Applying LAN Filters ............................................................................................... 630
40.6.2 Applying DMZ Filters .............................................................................................. 630
40.6.3 Applying Remote Node Filters ............................................................................... 631