Figure 190 Example Filter: Menu 21.1.3.1; Figure 191 Example Filter Rules Summary: Menu 21.1.3 - ZyXEL Communications P-793H User Manual

P-793H User's Guide

Figure 190 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 191 Example Filter Rules Summary: Menu 21.1.3

# A Type
- - ---- --------------------------------------------------------------- -
1 Y IP
2 N
3 N
4 N
5 N
6 N
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).
After you've created the filter set, you must apply it.
1 Enter 11 from the main menu to go to menu 11.
310
Menu 21.1.3.1 - TCP/IP Filter Rule
Filter #: 3,1
Filter Type= TCP/IP Filter Rule
Active= Yes
IP Protocol= 6
Destination: IP Addr=
Source: IP Addr=
TCP Estab= No
More= No
Action Matched= Drop
Action Not Matched= Forward
Menu 21.1.3 - Filter Rules Summary
Pr=6, SA=0.0.0.0, DA=0.0.0.0, DP=23
IP Source Route= No
IP Mask=
Port #= 23
Port # Comp= Equal
IP Mask=
Port #=
Port # Comp= None
Log= None
Filter Rules
Chapter 30 Filter Configuration
M m n
N D F