From owner-freebsd-net@FreeBSD.ORG Thu Jul 12 18:28:20 2012 Return-Path: Delivered-To: net@freebsd.org Received: from mx2.freebsd.org (mx2.freebsd.org [69.147.83.53]) by hub.freebsd.org (Postfix) with ESMTP id 88C9B106566B; Thu, 12 Jul 2012 18:28:19 +0000 (UTC) (envelope-from dougb@FreeBSD.org) Received: from [127.0.0.1] (hub.freebsd.org [IPv6:2001:4f8:fff6::36]) by mx2.freebsd.org (Postfix) with ESMTP id 67B5014F981; Thu, 12 Jul 2012 18:28:18 +0000 (UTC) Message-ID: <4FFF1742.9010906@FreeBSD.org> Date: Thu, 12 Jul 2012 11:28:18 -0700 From: Doug Barton Organization: http://www.FreeBSD.org/ User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1 MIME-Version: 1.0 To: George Neville-Neil References: <86liiqrnnq.wl%gnn@neville-neil.com> <4FFDF6C7.3030301@FreeBSD.org> In-Reply-To: X-Enigmail-Version: 1.4.2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Navdeep Parhar , net@freebsd.org Subject: Re: Interface MTU question... X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Jul 2012 18:28:20 -0000 While y'all are looking at MTU (which is an increasingly important topic as we move into a Gig+ world) I'm wondering what our support is for https://tools.ietf.org/html/rfc4821 ?? I asked this a while back and never got an answer. This method of PMTUD is really important given the massive (stupid) brokenness of people routinely blocking all of ICMPv4. Doug