From owner-freebsd-current@FreeBSD.ORG Sat Aug 2 01:39:26 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9F65537B401 for ; Sat, 2 Aug 2003 01:39:25 -0700 (PDT) Received: from stork.mail.pas.earthlink.net (stork.mail.pas.earthlink.net [207.217.120.188]) by mx1.FreeBSD.org (Postfix) with ESMTP id C103543FBD for ; Sat, 2 Aug 2003 01:39:24 -0700 (PDT) (envelope-from tlambert2@mindspring.com) Received: from user-38lc17n.dialup.mindspring.com ([209.86.4.247] helo=mindspring.com) by stork.mail.pas.earthlink.net with asmtp (SSLv3:RC4-MD5:128) (Exim 3.33 #1) id 19irv3-000173-00; Sat, 02 Aug 2003 01:39:18 -0700 Message-ID: <3F2B787D.D1C4BCAC@mindspring.com> Date: Sat, 02 Aug 2003 01:38:21 -0700 From: Terry Lambert X-Mailer: Mozilla 4.79 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Boris Kovalenko References: <3F2A2B17.4020700@tagnet.ru> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-ELNK-Trace: b1a02af9316fbb217a47c185c03b154d40683398e744b8a4da08ebe7f4e310037416541249d0c319350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c cc: freebsd-current@freebsd.org Subject: Re: bge & vlan stranges X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 02 Aug 2003 08:39:26 -0000 Boris Kovalenko wrote: > I have Compaq DL360G2 with Broadcom BCM5701 Gigabit Ethernet and > FreeBSD 5.1R installed. There are no problems if I use bge as usual > network card, but when I try to use 802.1Q vlans, I can't receive (only > receive, sending is ok) packets more then 1456 bytes! What is the > problem? BGE driver, VLAN driver or my network configuration? The encapsulation information is subtracted from your available MTU, so that is correct. Some cards have a bogus feature that lets you send longer frames than the normal MTU, but you can't rely on this feature being interoperable between card vendors, or being supported on all cards. I suppose you want to do this because you are trunking a channel that goes to a border device, and for some reason you have disabled receipt of all ICMP, instead of only abusable ICMP, and thus you have broken end-to-end path MTU discovery. It would be best if you were to simply fix your ICMP. -- Terry