Dealing with portscans

Greg Larkin glarkin at
Mon Sep 22 17:21:55 UTC 2008

Hash: SHA1

David Allen 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.

Hi David,

You might want to try security/portsentry from the ports tree.  It's a
bit dated, and it has no maintainer at the moment, but a cursory glance
at it tells me it might work for you.  It supports pf for blocking
connections once your trigger conditions are met.

Hope that helps,
- --
Greg Larkin       - The Power To Serve - Ready. Set. Code.
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