Is there a way for Snort to detect large http downloads?

["Jason Truong" <Jason.Truong () plumtree com>]

Is there a rule in Snort that can help to alert when a user it downloading a very large file from the internet...via 
http or ftp?
We have a 9mb pipe out to the internet and sometimes I get alerts (from Nagios) mentioning that the pipe if full.  I 
have already disabled P2P applications at the firewall level.  I can resort to making configs on the Cisco level but 
was wondering if there was a way for Snort to alert on large downloads.

Large can be say > 50 MB.

Thanks,

Jason 


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