Prestige 782R G.SHDSL Router

Step 1. Type 21 from the main menu to open Menu 21 – Filter Set Configuration.

Step 2. Type the index of the filter set you want to configure (in this case 3) and press [ENTER].

Step 3. Type a descriptive name or comment in the Edit Comments field (for eg. TELNET_WAN) and press [ENTER].

Step 4. Press [ENTER] at the message “Press [ENTER] to confirm or [ESC] to cancel” to open Menu 21.3 – Filter Rules Summary.

 

 

 

 

 

 

 

 

 

 

Press [SPACE BAR] to choose

 

 

 

Menu 21.3.1 - TCP/IP Filter Rule

 

 

 

 

 

 

 

 

 

 

Filter #: 3,1

 

 

 

 

 

this filter rule type. The first

 

 

 

 

 

 

 

 

filter rule type determines all

 

 

 

Filter Type= TCP/IP Filter Rule

 

 

 

 

 

 

Active= Yes

 

 

 

 

 

subsequent filter types within a

 

 

 

IP Protocol= 6

IP Source Route= No

 

 

set.

 

 

 

Destination: IP Addr= 0.0.0.0

 

 

 

 

 

 

IP Mask= 0.0.0.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Port #= 23

 

 

 

 

 

 

 

 

Port # Comp= Equal

 

 

 

Select Yes to make the rule

 

 

 

Source: IP Addr= 0.0.0.0

 

 

 

 

 

 

IP Mask= 0.0.0.0

 

 

 

active.

 

 

 

Port #=

 

 

 

 

 

 

 

 

Port # Comp= None

 

 

 

 

 

 

 

 

TCP Estab= No

 

 

 

 

 

6 is the TCP protocol.

 

 

 

More= No

Log= None

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Action Matched= Drop

 

 

 

 

 

 

 

 

 

 

Action Not Matched= Forward

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Press ENTER to Confirm or ESC to Cancel:

 

 

 

 

 

 

 

The port number for the telnet

 

 

 

 

 

 

 

 

 

 

 

There are no

 

 

 

 

 

 

 

service (TCP protocol) is 23.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

See RFC-1060 for port

 

 

 

Select Equal

 

 

more rules to

 

 

 

 

 

numbers of well-known

 

check.

 

 

 

 

here as we are

 

services.

 

 

 

 

 

 

 

looking for

 

 

 

 

 

 

 

 

 

 

packets going to

 

 

 

 

 

Select Drop here so that

 

 

 

 

 

 

 

 

 

 

 

port 23 only.

 

 

 

 

 

the packet will be

 

 

 

 

 

 

 

 

 

 

dropped if its destination

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

is the telnet port.

 

 

 

 

 

 

 

 

 

 

 

 

 

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 8-12 Sample Filter – Menu 21.3.1

8-16

Filter Configuration