Re: Yahoo Instant Messenger

[Ravi <ravivsn () roc co in>]

Hi Biswas,
There is more than that.
Yahoo! Messenger works on ports: 20,23,25,80,119,5050.  
Based on the Yahoo server IPs, we may succeed in blocking connections. 
That would effect port 80 traffic too. I dont know whether there is a 
snort signrature to stop Yahoo!Messenger traffic.
Yahoo Server domain names:

   * scs.msg.yahoo.com
   * scsa.msg.yahoo.com
   * scsb.msg.yahoo.com
   * scsc.msg.yahoo.com

For more info visit this link:

http://help.yahoo.com/help/us/mesg/twin/twin-36.html

-Ravi




Biswas, Proneet wrote:

> Traffic on potr 5050 should be yahoo messenger traffic.
>
>     -----Original Message-----
>     *From:* Michael Little [mailto:MLittle () bocaresort com]
>     *Sent:* Sunday, January 18, 2004 10:57 PM
>     *To:* snort-users () lists sourceforge net
>     *Subject:* [Snort-users] Yahoo Instant Messenger
>
>     I see in the current chat rules that there are rules to detect
>     MSN, AOL, and ICQ. Does any one have a rule or know how to detect
>     Yahoo instant messenger. I would like to block all instant
>     messenger traffic in my network.
>
>     Thanks,
>     Mike Little
>     Director of Network Services.
>      





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