Archive for December, 2012

Blocking Google Talk (Or any other Internet service)

December 12th, 2012 Comments off

A quick search we can easily see that Google Talk runs on 4 servers and uses 4 ports.
1. Connect to the Cisco ASA, and go to configure terminal mode.
2. Lets name our four Google Talkservers.

3. Then lets create a group for those servers.

4. And then a group for the ports we want to block.

5. To tie it all together we can simply add one ACL.

Note: This assumes you have an ACL called “outbound” thats applied to your outbound traffic, yours may have a different name, to find out issue a “show run access-group” command like so, your outbound ACL will be allied “in interface inside”. If yours is called something different then change the command above accordingly. If you don’t have one at all skip to step 6.

6. Only carry this step out if you DO NOT have an ACL applied to outbound traffic. and AFTER you have carried out step 5.

Categories: Networking