Technical Library

Certified Hardware & Software

Cisco Routers

Dedicated Access

Router Setup Pack

Filter Builder

Routing with Cisco 1720 Series for Dedicated Access Service

Installing Packet Filters

To install filters on a Cisco, you must go into enable mode, then configure mode on your router and enter the filter sets in.

	   enable
       configure terminal
       {Enter the body of the filter set}
       - Hit CTRL-Z
       wr term
       - Inspect your configuration to ensure they are correct
       wr mem

Once you've entered the filters, you can apply them to the serial interface on your router. If your serial interface is Serial0, use:

       configure terminal
       interface Serial0
       ip access-group 101 in {or what access-group number you used}
       ip access-group 102 out {or what access-group number you used}
       - Hit CTRL-Z
       wr term
       - Inspect your configuration to ensure it looks as you typed it.
       wr mem

To turn off the filters, you would do:

       configure terminal
       interface Serial0
       no ip access-group 101 in {or what access-group number you used}
       no ip access-group 102 out {or what access-group number you used}
       - Hit CTRL-Z
       wr mem

There are two major revisions of certified Cisco IOS. The syntax for the two revisions is significantly different. Please refer to the Cisco documentation for your revision of the the IOS. Or use our automated Filter Builder.