From owner-freebsd-questions@FreeBSD.ORG Sat Jul 16 21:51:34 2005 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6CBD716A41C for ; Sat, 16 Jul 2005 21:51:34 +0000 (GMT) (envelope-from nikolas.britton@gmail.com) Received: from wproxy.gmail.com (wproxy.gmail.com [64.233.184.198]) by mx1.FreeBSD.org (Postfix) with ESMTP id D896643D46 for ; Sat, 16 Jul 2005 21:51:33 +0000 (GMT) (envelope-from nikolas.britton@gmail.com) Received: by wproxy.gmail.com with SMTP id i6so806201wra for ; Sat, 16 Jul 2005 14:51:33 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=JE+HhnFgTcwxONer/eoDE/1GMjdpGy9rfMFlxCseg9r006ajB0QoXHO687BL30mDdeASq8+jnZRPnLD1R/f+MTQ3yr7LJWfzgAXoWi+O2oQMHfDvITtfGx51m0SXj68H9xVPVLv6GkRrshR9nvc3F0oBNuz308XhqXbQpFgwu+g= Received: by 10.54.53.45 with SMTP id b45mr1501218wra; Sat, 16 Jul 2005 14:50:08 -0700 (PDT) Received: by 10.54.124.11 with HTTP; Sat, 16 Jul 2005 14:50:08 -0700 (PDT) Message-ID: Date: Sat, 16 Jul 2005 16:50:08 -0500 From: Nikolas Britton To: FreeBSD - Questions Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Subject: Can I use jumbo frames on my LAN? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Nikolas Britton List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 16 Jul 2005 21:51:34 -0000 Is it true that jumbo frames are only useable with VLANs or LANs that are 100% GigE? The current LAN has a 16port 100Base-TX switch with a mix of 10/100 devices connected to it. 4 of the machines connected to the switch have built-in GigE support and their usage profile can take full advantage of it, so I'm going to be adding a 8port GigE switch to the current setup. The server, 4 workstations, and the old switch will be connected to this new switch. None of the switches supports 802.1q and the systems are all on the same subnet anyways. So if I tell my FreeBSD server that I want to use 9000 byte frames what happens to my other 10 and 100base-TX systems on the old switch? Does FreeBSD dynamically change it's mtu size based on the system it's talking to or will it always speak 9000 bytes at a time? My educated guess is that it always speaks 9000 bytes at a time and therefore I can't use jumbo frames on my network, it will screw up my 10 and 100base-TX systems. Am I right?