From owner-freebsd-security@FreeBSD.ORG Mon Oct 27 00:11:14 2003 Return-Path: Delivered-To: freebsd-security@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 37F2916A4B3 for ; Mon, 27 Oct 2003 00:11:14 -0800 (PST) Received: from tx0.oucs.ox.ac.uk (tx0.oucs.ox.ac.uk [129.67.1.163]) by mx1.FreeBSD.org (Postfix) with ESMTP id A688643FBD for ; Mon, 27 Oct 2003 00:11:12 -0800 (PST) (envelope-from colin.percival@wadham.ox.ac.uk) Received: from scan0.oucs.ox.ac.uk ([129.67.1.162] helo=localhost) by tx0.oucs.ox.ac.uk with esmtp (Exim 4.20) id 1AE2T1-0007Ij-Fa for freebsd-security@freebsd.org; Mon, 27 Oct 2003 08:11:11 +0000 Received: from rx0.oucs.ox.ac.uk ([129.67.1.161]) by localhost (scan0.oucs.ox.ac.uk [129.67.1.162]) (amavisd-new, port 25) with ESMTP id 27762-07 for ; Mon, 27 Oct 2003 08:11:11 +0000 (GMT) Received: from gateway.wadham.ox.ac.uk ([163.1.161.253]) by rx0.oucs.ox.ac.uk with smtp (Exim 4.20) id 1AE2T1-0007IW-1j for freebsd-security@freebsd.org; Mon, 27 Oct 2003 08:11:11 +0000 Received: (qmail 8480 invoked by uid 0); 27 Oct 2003 08:11:11 -0000 Received: from colin.percival@wadham.ox.ac.uk by gateway by uid 71 with qmail-scanner-1.16 (sweep: 2.14/3.71. spamassassin: 2.53. Clear:. Processed in 0.97428 secs); 27 Oct 2003 08:11:11 -0000 X-Qmail-Scanner-Mail-From: colin.percival@wadham.ox.ac.uk via gateway X-Qmail-Scanner: 1.16 (Clear:. Processed in 0.97428 secs) Received: from dhcp1131.wadham.ox.ac.uk (HELO piii600.wadham.ox.ac.uk) (163.1.161.131) by gateway.wadham.ox.ac.uk with SMTP; 27 Oct 2003 08:11:10 -0000 Message-Id: <5.0.2.1.1.20031027080917.020dd378@popserver.sfu.ca> X-Sender: cperciva@popserver.sfu.ca X-Mailer: QUALCOMM Windows Eudora Version 5.0.2 Date: Mon, 27 Oct 2003 08:11:07 +0000 To: "Francis A. Vidal" , From: Colin Percival In-Reply-To: <1067242009.66521.TMDA@irc.dagupan.com> References: <20031027080240.GA9552@rot13.obsecurity.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Subject: RE: Best way to filter "Nachi pings"? X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Security issues [members-only posting] List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 27 Oct 2003 08:11:14 -0000 At 16:06 27/10/2003 +0800, Francis A. Vidal wrote: >Wouldn't it break stuff like traceroute? Traceroute is fine -- it uses UDP packets. Tracert, on the other hand, uses ICMP echo request packets, and it suffers. I'm currently on a university network, and when there are connectivity issues (which seems to be quite often) I get very annoyed with the ICMP filtering. Colin Percival