ZyXEL Communications 2 Plus manual 22

Table of Contents
36.4.2 Example 2: Internet Access with a Default Server		.................................................	532
36.4.3 Example 3: Multiple Public IP Addresses With Inside Servers ..............................			532
36.4.4 Example 4: NAT Unfriendly Application Programs		.................................................	536
36.5	Trigger Port Forwarding ...................................................................................................		537
36.5.1 Two Points To Remember About Trigger Ports ......................................................			537
Chapter 37
Introducing the ZyWALL Firewall ........................................................................................			539
37.1 Using ZyWALL SMT Menus ............................................................................................			539
37.1.1 Activating the Firewall ............................................................................................			539
Chapter 38
Filter Configuration...............................................................................................................			541
38.1	Introduction to Filters .......................................................................................................		541
38.1.1 The Filter Structure of the ZyWALL ........................................................................			542
38.2	Configuring a Filter Set ....................................................................................................		544
38.2.1 Configuring a Filter Rule ........................................................................................			546
38.2.2 Configuring a TCP/IP Filter Rule ............................................................................			546
38.2.3 Configuring a Generic Filter Rule ...........................................................................			549
38.3	Example Filter ..................................................................................................................		550
38.4	Filter Types and NAT .......................................................................................................		552
38.5	Firewall Versus Filters .....................................................................................................		552
38.5.1 Packet Filtering: .....................................................................................................			552
38.5.2 Firewall ...................................................................................................................			553
38.6	Applying a Filter ..............................................................................................................		553
38.6.1 Applying LAN Filters ...............................................................................................			554
38.6.2 Applying DMZ Filters ..............................................................................................			554
38.6.3 Applying Remote Node Filters ...............................................................................			555
Chapter 39
SNMP Configuration .............................................................................................................			557
39.1	SNMP Configuration ........................................................................................................		557
39.2 SNMP Traps ....................................................................................................................			558
Chapter 40
System Information & Diagnosis.........................................................................................			559
40.1	Introduction to System Status ..........................................................................................		559
40.2	System Status ..................................................................................................................		559
40.3	System Information and Console Port Speed ..................................................................		561
40.3.1 System Information ................................................................................................			561
40.3.2 Console Port Speed ...............................................................................................			562
40.4	Log and Trace ..................................................................................................................		562
40.4.1 Viewing Error Log ...................................................................................................			562
22		ZyWALL 2 Plus User’s Guide