Prestige 650R-31/33 ADSL Router

Step 4. Press [ENTER] at the message “Press [ENTER] to confirm or [ESC] to cancel” to open Menu

21.3.1 – TCP/IP Filter Rule.

Menu 21.3.1 - TCP/IP Filter Rule

Filter #: 3,1

Filter Type= TCP/IP Filter Rule

Active= Yes

IP Source Route= No

IP Protocol= 6

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 #=

TCP Estab= No

Port # Comp= None

Log= None

More= No

Action Matched= Drop

Action Not Matched= Forward

Press ENTER to Confirm or ESC to Cancel:

Press [SPACE BAR] to choose this filter rule type. The first filter rule type determines all subsequent filter types within a set.

Select Yes to make the rule active.

6 is the TCP protocol.

There are no more rules to check.

Select Drop here so that the packet will be dropped if its destination is the telnet port.

Select Equal here as we are looking for packets going to port 23 only.

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

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.

Figure 8-15 Sample Filter – Menu 21.3.1

Step 5. Type 1 to configure the first filter rule. Make the entries in this menu as shown next.

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

Filter Configuration

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