Figure 24-12 Sample Filter - Menu 21.1.3.1 - ZyXEL Communications ZyAIR Wireless Gateway Series User Manual

ZyAIR Wireless Gateway Series User's Guide
Step 4. Press [ENTER] at the message
21.1.3.1 – TCP/IP Filter Rule.
Step 5. Type 1 to configure the first filter rule. Make the entries in this menu as shown next.
Filter #: 3,1
Filter Type= TCP/IP Filter Rule
Active= Yes
IP Protocol= 6
Destination: IP Addr= 0.0.0.0
Source: IP Addr= 0.0.0.0
TCP Estab= No
More= No
Action Matched= Drop
Action Not Matched= Forward
There are no
more rules to
check.
Select Drop here so that the
packet will be dropped if its
destination is the telnet port.
When you press [ENTER] to confirm, the following screen appears. Note that there is only one filter rule in
this set.
24-14
"
Menu 21.1.3.1 - TCP/IP Filter Rule
IP Mask= 0.0.0.0
Port #= 23
Port # Comp= Equal
IP Mask= 0.0.0.0
Port #=
Port # Comp= None
Press ENTER to Confirm or ESC to Cancel:

Figure 24-12 Sample Filter - Menu 21.1.3.1

Press ENTER to confirm or ESC to cancel" to open Menu
IP Source Route= No
Log= None
Select Forward here so that the packet will be forwarded if
its destination is not the telnet port and there are no more
rules in this filter set to check. Select Next if there are
more rules to check.
Select Yes to make the rule active.
6 is the TCP protocol.
The port number for the telnet
service (TCP protocol) is 23. See
RFC-1060 for port numbers of well-
known services.
Select Equal here
as we are looking
for packets going
to port 23 only.
Filter and Firewall Configuration