ZyXEL Communications G-2000 Plus - Manual (Page 323)

ZyAIR G-2000 Plus User’s Guide
Chapter 29 Filter Configuration 322
5 Press [ENTER] at the message [Press ENTER to confirm] to open Menu 21.1.3 - Filter
Rules Summary
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.
Figure 176 Example Filter: Menu 21.1.3.1
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
Action Matched= Drop
Action Not Matched= Forward
Press ENTER to Confirm or ESC to Cancel:
Press Space Bar to Toggle.
• Select Yes from the Active field to activate this rule.
• 6 is the TCP IP Protocol.
• The Port # for the telnet service (TCP protocol) is 23. See RFC 1060 for port numbers of
well-known services.
• Select Equal from the Port # Comp field as you are looking for packets going to port 23
only.
• Select Drop in the Action Matched field so that the packet will be dropped if its
destination is the telnet port.
• Select Forward from the Action Not Matched field so that the packet will be forwarded
if its destination is not the telnet port.
• Press [SPACE BAR] and then [ENTER] to choose this filter rule type. The first filter rule
type determines all subsequent filter types within a set.
When you press [ENTER] to confirm, you will see the following screen. Note that there is
only one filter rule in this set.