If you would like to block AOL Instant Messenger with another firewall, then you have to block 2 things: the port on which AIM operates, port 5190, and/or the server to which the majority of all AIM clients connect: login.oscar.aol.com.
If you would like to block ICQ with another firewall, then you have to block 2 things: the port on which it operates, port 5190, and/or the server to which the majority of all ICQ clients connect: login.oscar.aol.com.
Blocking MSN Messenger is pretty easy,
TCP Port 1863
IP Range 22.214.171.124/24
Blocking Yahoo Messenger is not as easy as blocking other pieces of software. You see, Yahoo has their servers seperated out across various IPs, and you can't just do a range block, for risk of making parts of Yahoo disappear from your users browsers. So, to block Yahoo Messenger, you must block these 2servers by DNS address, not range,
If the ports are consistant for the chat services, wouldn't it be simpler to just block the port and not specify a host. Unless the port is used by other applications that would need to go through your firewall or router access-list there would be no reason to leave that port open.
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