Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751737AbcDUIIJ (ORCPT ); Thu, 21 Apr 2016 04:08:09 -0400 Received: from out2-smtp.messagingengine.com ([66.111.4.26]:53781 "EHLO out2-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751487AbcDUIID (ORCPT ); Thu, 21 Apr 2016 04:08:03 -0400 X-Sasl-enc: Aq/B+PTs3q+gUBG7BJCGg+hELzLodHTlO18UCp2TRgtt 1461226081 Subject: Re: IPv6 patch mysteriously breaks IPv4 VPN To: Valdis Kletnieks , bjorn@mork.no, "David S. Miller" References: <15023.1461205453@turing-police.cc.vt.edu> Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org From: Hannes Frederic Sowa Message-ID: <57188A60.9060901@stressinduktion.org> Date: Thu, 21 Apr 2016 10:08:00 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1 MIME-Version: 1.0 In-Reply-To: <15023.1461205453@turing-police.cc.vt.edu> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 939 Lines: 22 On 21.04.2016 04:24, Valdis Kletnieks wrote: > I'll say up front - no, I do *not* have a clue why this commit causes this > problem - it makes exactly zero fsking sense. > > Scenario: $WORK is blessed with a Juniper VPN system. I've been > seeing for a while now (since Dec-ish) an issue where at startup, > the tun0 device will get wedged. ifconfig reports this: > > tun0: flags=4305 mtu 1400 > inet 172.27.1.165 netmask 255.255.255.255 destination 172.27.1.165 > inet6 fe80::6802:d95c:f3f4:2a6f prefixlen 64 scopeid 0x20 > unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 500 (UNSPEC) > RX packets 0 bytes 0 (0.0 B) > RX errors 0 dropped 0 overruns 0 frame 0 > TX packets 1 bytes 48 (48.0 B) > TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 Can you show us a ip -d l l ? Thanks, Hannes