From owner-freebsd-stable@FreeBSD.ORG Thu Apr 17 17:50:34 2003 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E1F0A37B401; Thu, 17 Apr 2003 17:50:34 -0700 (PDT) Received: from khavrinen.lcs.mit.edu (khavrinen.lcs.mit.edu [18.24.4.193]) by mx1.FreeBSD.org (Postfix) with ESMTP id E2A3443FA3; Thu, 17 Apr 2003 17:50:31 -0700 (PDT) (envelope-from wollman@khavrinen.lcs.mit.edu) Received: from khavrinen.lcs.mit.edu (localhost [IPv6:::1]) by khavrinen.lcs.mit.edu (8.12.9/8.12.9) with ESMTP id h3I0oUmA033278 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 17 Apr 2003 20:50:31 -0400 (EDT) (envelope-from wollman@khavrinen.lcs.mit.edu) Received: (from wollman@localhost) by khavrinen.lcs.mit.edu (8.12.9/8.12.9/Submit) id h3I0oUbg033275; Thu, 17 Apr 2003 20:50:30 -0400 (EDT) (envelope-from wollman) Date: Thu, 17 Apr 2003 20:50:30 -0400 (EDT) From: Garrett Wollman Message-Id: <200304180050.h3I0oUbg033275@khavrinen.lcs.mit.edu> To: Brooks Davis In-Reply-To: <20030418001904.GA23983@Odin.AC.HMC.Edu> References: <16031.17219.159093.279782@canoe.velocet.net> <20030418001904.GA23983@Odin.AC.HMC.Edu> cc: freebsd-net@freebsd.org cc: freebsd-stable@freebsd.org Subject: Re: vlan0 on em0 has mtu 1496 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Apr 2003 00:50:35 -0000 < said: > Because the vlan header takes up 4 bytes. With em(4) devices it looks > like fixing that should be a simple matter of raising the real > interface's MTU to 1504. Actually, the parent interface's MTU should not be touched. The link-layer header length is what needs to be increased. -GAWollman