Instant Messaging SPI (Beginner)

I'm just starting using the IP addresses on our 5510 and thought, I want to start by trying to block instant messaging. I started with a few alerts and found that one of my IT staff alert to express activity OBJECTIVE. It has an AOL e-mail account (guess I need to pay him more money) and when newspapers of the he in to AOL Instant Messaging system is on the right side. I have problems of blocking the activity of the GOAL without him blocking off getting his AOL mail. Should what setting I use?

Thanks for any help and if this is not the right forum to post something like this let me know.

Paul

I used the instructions here:

http://6200networks.com/2007/10/31/block-IM-traffic-on-ASA/

Runs like a champ. Use ASA firewall, not IP addresses.

I have an IPS too, and signature (predefined) active IPS rules intercept the activity of MSN Messenger, AIM, etc. Edition of such rules to reset the TCP, Deny packets, etc.

Third, I created zones DNS pointing things like talk.google.com on 127.0.0.1. Defence multi-level and all that.

So far, it's working. I can also look at the IPS give me information events indicating if IM IPS signature rules enabled. Pretty fun.

Let us know how it works for you.

-Bill

Tags: Cisco Security

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