From owner-freebsd-net@FreeBSD.ORG Wed Aug 14 13:40:27 2013 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 25DDE577 for ; Wed, 14 Aug 2013 13:40:27 +0000 (UTC) (envelope-from lists@rewt.org.uk) Received: from hosted.mx.as41113.net (abby.lhr1.as41113.net [91.208.177.20]) by mx1.freebsd.org (Postfix) with ESMTP id E43772B9B for ; Wed, 14 Aug 2013 13:40:24 +0000 (UTC) Received: from [192.168.1.54] (staff-ns50-3.as25178.net [212.9.98.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: lists@rewt.org.uk) by hosted.mx.as41113.net (Postfix) with ESMTPSA id 3cFWs3140pzwt for ; Wed, 14 Aug 2013 14:31:03 +0100 (BST) Message-ID: <520B8694.1050407@rewt.org.uk> Date: Wed, 14 Aug 2013 14:31:00 +0100 From: Joe Holden User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: freebsd-net@freebsd.org Subject: Updating route MTU when interface changes Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Aug 2013 13:40:27 -0000 Hi guys, I noticed this some years ago but I just checked and its still there - when the mtu of an interface is changed, any routes (eg connected route) using that interface aren't updated until the interface is shut/unshut - is this by design or is it an oversight? Having to down/up remote machine interfaces that are potentially forwarding traffic just to change the mtu seems silly. Ta, Joe