From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andy Furniss <andy.furniss@dsl.pipex.com>
Date: Tue, 26 Apr 2005 23:11:29 +0000
Subject: Re: [LARTC] IP2P & Skype question
Message-Id: <426ECAA1.90705@dsl.pipex.com>
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To: lartc@vger.kernel.org

Taylor, Grant wrote:
>> Regarding yahoo messenger, I have not looked at this for a while. As I 
>> understood, it used a single outgoing port and if blocked - end of 
>> yahoo....  Or has this changed since I last looked?
> 
> 
> This must have changed as Yahoo will try to connect 4 different servers 
> on 8 different ports for basic IM use.  If you want to use other 
> features like the webcam, file shareing, or voice chat there are 
> different servers and different ports that your client will connect to.  
> Take a look at 
> http://help.yahoo.com/help/us/sbc/messenger/signin/signin-02.html if you 
> want to see Yahoo's definition of what the client does.  I wrote a RegEx 
> of the various host names that Yahoo will connect to, 
> "((scs(|a-z)|filetransfer).msg|v(0-99).(vc|vip).sc(a-z|0-99)|webcam).yahoo.com".  
> If I could implement a match in DNS for this RegEx I would do so to 
> prevent computers on my networks from finding things.

What fun it must be being a netadmin - what don't you want to block, by 
which I mean wouldn't it be easier to block everything and run 
squid/mail server.

Andy.

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