From owner-freebsd-net@FreeBSD.ORG Sun Dec 18 19:10:32 2011 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 82649106566C for ; Sun, 18 Dec 2011 19:10:32 +0000 (UTC) (envelope-from ml@netfence.it) Received: from cp-out9.libero.it (cp-out9.libero.it [212.52.84.109]) by mx1.freebsd.org (Postfix) with ESMTP id F2FA78FC13 for ; Sun, 18 Dec 2011 19:10:26 +0000 (UTC) X-CTCH-Spam: Unknown X-CTCH-RefID: str=0001.0A0B020D.4EEE3AA0.0155,ss=1,re=0.000,fgs=0 X-libjamoibt: 1555 Received: from soth.ventu (151.41.159.94) by cp-out9.libero.it (8.5.133) id 4EA2ECE108170264 for freebsd-net@freebsd.org; Sun, 18 Dec 2011 20:10:24 +0100 Received: from alamar.ventu (alamar.ventu [10.1.2.18]) by soth.ventu (8.14.4/8.14.4) with ESMTP id pBIJAKxE059798 for ; Sun, 18 Dec 2011 20:10:20 +0100 (CET) (envelope-from ml@netfence.it) Message-ID: <4EEE3A9C.4040200@netfence.it> Date: Sun, 18 Dec 2011 20:10:20 +0100 From: Andrea Venturoli User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; it-IT; rv:1.9.2.24) Gecko/20111207 Thunderbird/3.1.16 MIME-Version: 1.0 To: freebsd-net@freebsd.org References: <4EE8FA10.8090502@netfence.it> In-Reply-To: <4EE8FA10.8090502@netfence.it> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.72 on 10.1.2.13 Subject: Re: Intel 82550 Pro/100 Ethernet and TSO troubles 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: Sun, 18 Dec 2011 19:10:32 -0000 On 12/16/11, Eugene Grosbein wrote: (Sorry Eugene, I didn't get your message until I searched the web). > Do you use NAT? man ipfw clearly states: > > ipfw nat is not compatible with > the TCP segmentation offloading (TSO). Thus, to reliably nat your net- > work traffic, please disable TSO on your NICs using ifconfig(8) Yes, I'm using ipfw and NAT, so this is the problem. Thanks for solving me this. I'm just wondering if it was a good idea to enable TSO by default without at least a warning in the release notes or in UPDATING. This has caused me some headaches, which is ok, I'm just sorry I've also wasted some of YongHyeon's time; what's worse, I believe I won't be the only one hit by this. bye & Thanks av.