From owner-freebsd-net@FreeBSD.ORG Sat Dec 29 02:10:09 2007 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7B44116A419 for ; Sat, 29 Dec 2007 02:10:09 +0000 (UTC) (envelope-from bzeeb-lists@lists.zabbadoz.net) Received: from mail.cksoft.de (mail.cksoft.de [62.111.66.27]) by mx1.freebsd.org (Postfix) with ESMTP id 3EFE913C43E for ; Sat, 29 Dec 2007 02:10:09 +0000 (UTC) (envelope-from bzeeb-lists@lists.zabbadoz.net) Received: from localhost (amavis.str.cksoft.de [192.168.74.71]) by mail.cksoft.de (Postfix) with ESMTP id A645841C541 for ; Sat, 29 Dec 2007 03:10:07 +0100 (CET) X-Virus-Scanned: amavisd-new at cksoft.de Received: from mail.cksoft.de ([62.111.66.27]) by localhost (amavis.str.cksoft.de [192.168.74.71]) (amavisd-new, port 10024) with ESMTP id zfApY9uAl-Hd for ; Sat, 29 Dec 2007 03:10:05 +0100 (CET) Received: by mail.cksoft.de (Postfix, from userid 66) id 53D6441C752; Sat, 29 Dec 2007 03:10:05 +0100 (CET) Received: from maildrop.int.zabbadoz.net (maildrop.int.zabbadoz.net [10.111.66.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.int.zabbadoz.net (Postfix) with ESMTP id 308AE444885 for ; Sat, 29 Dec 2007 02:08:08 +0000 (UTC) Date: Sat, 29 Dec 2007 02:08:08 +0000 (UTC) From: "Bjoern A. Zeeb" X-X-Sender: bz@maildrop.int.zabbadoz.net To: freebsd-net@FreeBSD.org Message-ID: <20071229020307.P81630@maildrop.int.zabbadoz.net> X-OpenPGP-Key: 0x14003F198FEFA3E77207EE8D2B58B8F83CCF1842 MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: Subject: [patch] ICMP unreach, frag needed but df set + ro mtu broken 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: Sat, 29 Dec 2007 02:10:09 -0000 Hi, while looking at an entirely different problems I found that icmp unreach, frag needed but df set does not take into account any route mtu in ip_forward breaking pmtu. I put a patch here: http://sources.zabbadoz.net/freebsd/patchset/patch-20071228-02-ip-forward-unreach-needfrag-ro.diff Testing and review welcome. PS: After a quick glance I think ip_fastfwd should be ok. -- Bjoern A. Zeeb bzeeb at Zabbadoz dot NeT Software is harder than hardware so better get it right the first time.