ZyXEL Communications 2WG manual 25

		Table of Contents
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

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ZyWALL 2WG User’s Guide