ZyWALL 2 Plus User’s Guide
22 Table of Contents
30.4.1 Internet Access Only .............................................................................424
30.4.2 Example 2: Internet Access with a Default Server ................................426
30.4.3 Example 3: Multiple Public IP Addresses With Inside Servers .............426
30.4.4 Example 4: NAT Unfriendly Application Programs ...............................430
30.5 Trigger Port Forwarding .................................................................................432
30.5.1 Two Points To Remember About Trigger Ports .....................................432
Chapter 31
Introducing the ZyWALL Firewall ....................................................................... 435
31.1 Accessing the Firewall Settings .....................................................................435
31.2 Firewall SMT Menus ......................................................................................435
31.2.1 Activating the Firewall ...........................................................................435
Chapter 32
Filter Configuration.............................................................................................. 437
32.1 Introduction to Filters ......................................................................................437
32.1.1 The Filter Structure of the ZyWALL ......................................................438
32.2 Packet Filtering Versus Firewall .....................................................................440
32.2.1 Packet Filtering .....................................................................................440
32.2.1.1 When To Use Filtering .................................................................440
32.2.2 Firewall .................................................................................................440
32.2.2.1 When To Use The Firewall ..........................................................441
32.3 Configuring a Filter Set ..................................................................................441
32.3.1 Configuring a Filter Rule .......................................................................443
32.3.2 Configuring a TCP/IP Filter Rule ..........................................................443
32.3.3 Configuring a Generic Filter Rule .........................................................446
32.4 Example Filter ................................................................................................448
32.5 Filter Types and NAT ......................................................................................450
32.6 Firewall Versus Filters ....................................................................................451
32.7 Applying a Filter ............................................................................................451
32.7.1 Applying LAN Filters .............................................................................451
32.7.2 Applying Remote Node Filters ..............................................................452
Chapter 33
SNMP Configuration ............................................................................................ 453
33.1 SNMP Configuration ......................................................................................453
33.2 SNMP Traps ...................................................................................................454
Chapter 34
System Information & Diagnosis........................................................................ 455
34.1 Introduction to System Status ........................................................................455
34.2 System Status ................................................................................................455
34.3 System Information and Console Port Speed ................................................457
