ZyXEL Communications 5 Series User Manual

 Chapter 46 Filter Configuration

ZyWALL 5/35/70 Series User’s Guide

Figure 444   Example Filter: Menu 21.1.3.1

The port number for the telnet service (TCP protocol) is 23. See RFC 1060 for port numbers of 
well-known services.

When you press [ENTER] to confirm, you will see the following screen. Note that there is 
only one filter rule in this set.

Figure 445   Example Filter Rules Summary: Menu 21.1.3

This shows you that you have configured and activated (A = Y) a TCP/IP filter rule (Type = 
IP, Pr = 6) for destination telnet ports (DP = 23).

M = N means an action can be taken immediately. The action is to drop the packet (m = D) if 
the action is matched and to forward the packet immediately (n = F) if the action is not 
matched no matter whether there are more rules to be checked (there aren’t in this example).

                  Menu 21.1.3.1 - TCP/IP Filter Rule

Filter #: 3,1            

Filter Type= TCP/IP Filter Rule            

Active= Yes            

IP Protocol= 6      IP Source Route= No            

Destination: IP Addr= 0.0.0.0                         

             IP Mask= 0.0.0.0                         

             Port #= 23                         

             Port # Comp= Equal                 

     Source: IP Addr= 0.0.0.0                         

             IP Mask= 0.0.0.0                         

             Port #= 0                         

             Port # Comp= None           

TCP Estab= No            

More= No             Log= None            

         Press ENTER to Confirm or ESC to Cancel:

Press Space Bar to Toggle.

         Menu 21.1.3 - Filter Rules Summary

# A Type                       Filter Rules              M m n

- - ---- ----------------------------------------------- - - -

1 Y IP   Pr=6, SA=0.0.0.0, DA=0.0.0.0, DP=23             N D F

2 N

3 N

4 N7

5 N

6 N

Enter Filter Rule Number (1-6) to Configure: 1