Re: Stopping portscanning

[Max Lopez <mlopez () itesm mx>]

HI Alberto:

Yes, I am using spp_portscan2, so my question was something like this:

I have a RULE for the Kazaa traffic, and the "flex response" is the "tcp 
reset".

Now, for the  "portscan2" plugin, how do I send the same "tcp reset"??
Or, there are any other way to stop a portscan using Snort or some plugins??

And I am going to move the portscan2 parameters to high numbres, so the web 
transactions are not broken (I hope).

Thanks,.



On Friday 07 March 2003 12:01 pm, Alberto Gonzalez wrote:
> 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.

-- 

Max Lopez
Departamento de Redes Corporativo
ITESM Sistema
Tel. (81) 8358-2000  ext. 4136
Fax. (81) 8328-4208
Monterrey Mexico.


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