Re: Stopping portscanning

[Alberto Gonzalez <electron () wwjh net>]

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How are you getting these portscan alerts? via spp_portscan/2 or via 
rules? You would have to configure ignorehosts so you wouldn't be 
reseting valid connections. Though inadvertently you might reset valid web 
traffic.

Recommendations:
1. Either use SnortSam, Hogwash, or Snort-inline. 
2. Play with spp_portscan threshold, ignorehosts before putting into 
   production. 

Maybe the rest of the gang can recommend something else.

Cheers!
  Alberto Gonzalez

On Fri, 7 Mar 2003, Max Lopez wrote:

> Hi:
>
> I am using Snort to detect Kazaa and Gnutella trafic, and to send a TCP Reset 
> to both IPs when the Snort detects the traffic, we have been able to lower 
> the traffic in our "Internet 2" serial (E3-34mbps) from 10-12mbps to 1-2 
> mbps.
>
> Now I am seeing a lot of portscans, so I am looking for some way to stop that 
> portscanning, I am not sure if there is some way to send TCP_RESETs or 
> HOST_UNREACHABLE icmp's.. do you have any way of stopping those scans??
>
> Thanks a lot.

- --
"Success comes to the person who does today, what you are thinking of doing tomorrow." 
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