P314 Broadband Sharing Gateway with 4-Port Switch

 

 

 

 

 

 

 

 

 

 

Press the [SPACE BAR] to

 

 

 

Menu 21.3.1 - TCP/IP Filter Rule

 

 

 

 

 

 

 

choose this filter rule type. The

 

 

 

 

 

 

 

 

 

 

 

 

Filter #: 3,1

 

 

 

 

 

first filter rule type determines

 

 

Filter Type= TCP/IP Filter Rule

 

 

 

 

 

 

 

 

all subsequent filter types

 

 

Active= Yes

 

 

 

 

 

 

 

IP Protocol= 6

IP Source Route= No

 

 

within a 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

 

 

 

 

 

 

 

 

 

active.

 

 

 

IP Mask= 0.0.0.0

 

 

 

 

 

 

Port #= 0

 

 

 

 

 

 

 

 

Port # Comp= None

 

 

 

 

 

 

 

TCP Estab= No

 

 

 

 

 

6 is the TCP protocol.

 

 

More= No

Log= None

 

 

 

 

 

Action Matched= Drop

 

 

 

 

 

 

 

 

 

Action Not Matched= Check Next Rule

 

 

 

 

 

 

Press ENTER to Confirm or ESC to Cancel:

 

 

 

 

 

Press Space Bar to Toggle.

 

 

 

 

 

The port number for the telnet

 

 

 

 

 

 

 

 

 

 

 

No more rules to

 

 

 

 

 

 

 

service (TCP protocol) is 23.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

See RFC 1060 for port numbers

 

 

 

Select Equal

 

 

check to block

 

 

 

 

 

 

 

 

 

 

 

of well-known services.

 

telnet.

 

 

 

 

here as we are

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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 Check Next Rule here so that the next rule is checked if the destination is not the telnet port.

Figure 7-11

Example Filter

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

7-14

Filter Configuration