On 8/1/12 9:24 AM, Administrator wrote:
> 
> an easy way is to limit the amount of tcp connections at the same time on a 
> edge router. this is usualy done to get rid of script kiddies which try to 
> break into ssh by trying every possible password for root. if tcp init is 
> however rate limited then its like a slow connection for opening sessions. 
> this could affect outgoing http though so its smarter to exclude port 80 and 
> 443 from it.

That way you will not catch scanning that goes across an entire netblock
on port 80 to look for a possible specific vulnerable web applications
(portscanning + application vulnerability check).

You need to look at very specific portscanning pattern, finely tuned so
that it would not risk to match also good tor traffic.

-naif
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