ZyXEL Communications 10, 50 Step, Step, Step, Figure 18-11Example Filter — Menu

ZyWALL 10/50 Internet Security Gateway

Step 4. Enter a descriptive name or comment in the Edit Comments field and press [ENTER].

Step 5. Press [ENTER] at the message [Press ENTER to confirm] to open Menu 21.1.3 - Filter Rules Summary.

Step 6. Enter 1 to configure the first filter rule (the only filter rule of this set). Make the entries in this menu as shown in the following figure.

					Press [SPACE BAR] to choose this filter rule
		Menu 21.1.3.1 - TCP/IP Filter Rule
					type. The first filter rule type determines all
Filter #: 3,1
Filter Type= TCP/IP Filter Rule					subsequent filter types within a set.
Active= Yes		IP Source Route= No
IP Protocol= 6
Destination: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 23
Port # Comp= Equal					Select Yes to make the rule active.
Source: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 0
Port # Comp= None
TCP Estab= No		Log= None
More= No					6 is the TCP protocol.
Action Matched= Drop
Action Not Matched= Forward
Press ENTER to Confirm or ESC to Cancel:				The port	number for the telnet service (TCP protocol)
Press Space Bar to Toggle.				is 23. See	RFC 1060 for port numbers of well-known
	There are no more rules to check.			services.
			Select Equal here as you are looking for packets
			going to port 23 only.

Select Drop here so that the packet will

be dropped if its destination is the telnet

port.

Select Forward here so that the packet will be

forwarded if its destination is not the telnet port.

Figure 18-11 Example Filter — Menu 21.1.3.1

Filter Configuration 18-15