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Date: Mon, 22 Sep 2008 20:01:21 +0300
From: Ghirai <ghirai@ghirai.com>
To: freebsd-questions@freebsd.org
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Subject: Re: Dealing with portscans
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On Mon, 22 Sep 2008 08:17:02 -0700
"David Allen" <the.real.david.allen@gmail.com> wrote:

> Over the last few weeks I've been getting numerous ports scans, each
> from unique hosts.  The situation is more of an annoyance than
> anything else, but I would prefer not seeing or having to deal with
> an extra 20-30K entries in my logs as was the case recently.
> 
> I use pf for firewalling, and while it does offer different methods
> (max-src-conn, max-src-conn-rate, etc.) for dealing with abusive
> hosts, it doesn't seem to offer much in the way of dealing with
> repeated blocked (non-stateful) connection attempts from a given host.
> 
> Short of running something like snort, is there a suitable tool for
> dealing with this?  If not, I'll probably resort to running a cronjob
> to parse the logfile and add the offending hosts manually.

Add the abusive hosts to a table x, via max-src-conn, max-src-conn-rate,
etc., then add near the top of your ruleset:

block drop quick from <x>

Hope it helps.

Regards,
Ghirai.