From owner-freebsd-questions@FreeBSD.ORG Mon Sep 22 20:44:48 2008 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3B9B61065670 for ; Mon, 22 Sep 2008 20:44:48 +0000 (UTC) (envelope-from gpeel@thenetnow.com) Received: from thenetnow.com (thenetnow.com [69.90.69.141]) by mx1.freebsd.org (Postfix) with ESMTP id 1221A8FC1A for ; Mon, 22 Sep 2008 20:44:42 +0000 (UTC) (envelope-from gpeel@thenetnow.com) Received: from hpeel.ody.ca ([216.240.12.2] helo=GRANT) by constellation.thenetnow.com with esmtpa (Exim 4.63 (FreeBSD)) (envelope-from ) id 1KhsGv-0004Bv-OA; Mon, 22 Sep 2008 16:44:41 -0400 Message-ID: From: "Grant Peel" To: "David Allen" , References: <2daa8b4e0809220817v10c4a657l6ee76f853a62b246@mail.gmail.com><48D7D434.6080702@FreeBSD.org> <2daa8b4e0809221306y3e8ebd4eg321377269ee2e1@mail.gmail.com> Date: Mon, 22 Sep 2008 16:44:37 -0400 Organization: The Net Now MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Cc: Subject: Re: Dealing with portscans X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Grant Peel List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Sep 2008 20:44:48 -0000 ----- Original Message ----- From: "David Allen" To: Sent: Monday, September 22, 2008 4:06 PM Subject: Re: Dealing with portscans > On 9/22/08, Greg Larkin wrote: >> 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. > > I'll give it a try. > > FWIW, I did discover that parsing the log files to get a list of > offending hosts (denied a number of times above a given certain > threshold) wasn't really as slow or troublesome as I thought. That > slightly hackish approach might be useful for port scans in addition > to the various rubbish I get sent. > > Thanks to both you and Jeff Laine for the replies. > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" > > Hiyas, Would it work with IPFW or just PF? Can PF and IPFW run at the same time? -Grant