ZyXEL Communications G.SHDSL.bis 4-port Security Gateway P-793H - Manual (Page 310)

P-793H User’s Guide
310 Chapter 30 Filter Configuration
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
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.
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=
IP Mask=
Port #= 23
Port # Comp= Equal
Source: IP Addr=
IP Mask=
Port #=
Port # Comp= None
TCP Estab= No
More= No Log= None
Action Matched= Drop
Action Not Matched= Forward
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 N
5 N
6 N