From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) by finch.gentoo.org (Postfix) with ESMTP id CE9BE1381FA for ; Mon, 5 May 2014 10:58:24 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 6BC60E0B7E; Mon, 5 May 2014 10:58:19 +0000 (UTC) Received: from mail.taydin.org (mail.taydin.org [94.23.38.220]) by pigeon.gentoo.org (Postfix) with ESMTP id 5F468E0B74 for ; Mon, 5 May 2014 10:58:18 +0000 (UTC) Received: from [10.8.2.214] (91.6.195.173.client.static.strong-in41.as13926.net [173.195.6.91]) by mail.taydin.org (Postfix) with ESMTPSA id AE9DD9F650 for ; Mon, 5 May 2014 12:58:14 +0200 (CEST) Message-ID: <53676EBA.1060305@taydin.org> Date: Mon, 05 May 2014 13:58:02 +0300 From: Timur Aydin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 To: gentoo-user@lists.gentoo.org Subject: [gentoo-user] Forwarding bug in kernel 3.14.1 and 3.14.2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Archives-Salt: b1bee065-a89a-4c70-a174-c16b286b4a56 X-Archives-Hash: dca07afd6e76d71659699fd491d08430 Hi, To all folks that use their gentoo linux PC as their internet router/gateway, don't upgrade your kernel to 3.14.1 or 3.14.2. These versions have a bug related to IP packet forwarding. Internet upload speed for the NAT clients gets extremely slow (in the order of 10Kbps), which download speed remain unaffected. I have spent the entire weekend trying to debug the slow upload issue. I tried different NIC's, different cables, different clients etc, problem was still occurring. Upload/download from the Gentoo linux PC is fine, but any NAT client exhibits the slow upload speed problem. I also suspected that somehow the MSS clamping with iptables doesn't work, that wasn't the problem either, because even with all tables flushed and only IP MASQUERADING in place the problem was there. I finally found a bug report that explains the symtom: http://www.spinics.net/lists/netdev/msg280571.html I then downgraded the kernel to 3.13.11, which fixed the problem. So, all of you guys using your Gentoo PC as your internet gateway, keep 3.13.11 around for a while. -- Timur