Re: Snort 1.9 and spp_portscan2

[Erek Adams <erek () snort org>]

On Sun, 2 Mar 2003, Vlad Gavrila wrote:

> I have recently installed Snort 1.9 on a Linux box that also acts as a
> proxy and dns server for my lan.
>
> After having it run for a few hours, I found many portscan logs targeted
> against my server, that have the source port either 80 or 53. I know
> that these come from sequential response to either http or dns requests.
>
> My problem is blocking those connections that are using 80 or 53 as
> their source port. Is there a way to solve this?

If you look at the traffic, you should see that it's coming from websites
that you surf and visit.  Since you're using a proxy, all web requests on
the 'inside' must go thru the proxy to get 'outside'.  Look at some of the
traffic.  I'm sure you'll see that it's just normal web and/or DNS
traffic.

If you want to ignore traffic, you have two options [0].  Both have the
potential to open a hole in your security, so be cautious.

Cheers!

-----
Erek Adams

   "When things get weird, the weird turn pro."   H.S. Thompson


[0]     http://www.theadamsfamily.net/~erek/snort/ignore.txt


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