From owner-freebsd-net@FreeBSD.ORG Thu Jul 12 21:00:04 2012 Return-Path: Delivered-To: net@freebsd.org Received: from mx2.freebsd.org (mx2.freebsd.org [IPv6:2001:4f8:fff6::35]) by hub.freebsd.org (Postfix) with ESMTP id 32FAC106566C; Thu, 12 Jul 2012 21:00:04 +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 9C81E14FD80; Thu, 12 Jul 2012 21:00:03 +0000 (UTC) Message-ID: <4FFF3AD3.50703@FreeBSD.org> Date: Thu, 12 Jul 2012 14:00:03 -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> <4FFF1742.9010906@FreeBSD.org> <4C0DD966-6B60-4ADF-8476-D3C0CB3FC1C3@freebsd.org> In-Reply-To: <4C0DD966-6B60-4ADF-8476-D3C0CB3FC1C3@freebsd.org> 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 21:00:04 -0000 On 07/12/2012 01:50 PM, George Neville-Neil wrote: > > On Jul 12, 2012, at 14:28 , Doug Barton wrote: > >> 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. > > We do not support that RFC and support in other OSs is quite limited. > It does not seem to be have been taken up by the Internet community > in general. > > That being said, it is an interesting mechanism. Probably not a bad idea > for a wish list item. Thanks for the response. Doug