From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Fw: [Bug 99081] New: Bridge multicast snooping breaks ICMPv6 Date: Thu, 28 May 2015 07:35:39 -0700 Message-ID: <20150528073539.2619267a@urahara> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit To: netdev@vger.kernel.org Return-path: Received: from mail-pa0-f42.google.com ([209.85.220.42]:35165 "EHLO mail-pa0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751207AbbE1Ofk (ORCPT ); Thu, 28 May 2015 10:35:40 -0400 Received: by pacwv17 with SMTP id wv17so24968023pac.2 for ; Thu, 28 May 2015 07:35:40 -0700 (PDT) Received: from urahara (static-50-53-82-155.bvtn.or.frontiernet.net. [50.53.82.155]) by mx.google.com with ESMTPSA id om10sm2612059pbb.58.2015.05.28.07.35.39 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 28 May 2015 07:35:40 -0700 (PDT) Sender: netdev-owner@vger.kernel.org List-ID: Begin forwarded message: Date: Thu, 28 May 2015 10:34:55 +0000 From: "bugzilla-daemon@bugzilla.kernel.org" To: "shemminger@linux-foundation.org" Subject: [Bug 99081] New: Bridge multicast snooping breaks ICMPv6 https://bugzilla.kernel.org/show_bug.cgi?id=99081 Bug ID: 99081 Summary: Bridge multicast snooping breaks ICMPv6 Product: Networking Version: 2.5 Kernel Version: 4.0.4 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Other Assignee: shemminger@linux-foundation.org Reporter: sgunderson@bigfoot.com Regression: No Hi, I've seen this reported many times around the net, with no definite solution; since I got hit by it again and now used the latest kernel, I thought the best place would be the kernel Bugzilla. I have a bridge br0 with eth0 on it, and then some tap devices from KVM guests. In this situation, by default, I don't have IPv6. I can't ping anything because ND fails. I've seen this over multiple kernel versions for years, so I'm fairly certain this is not something about my specific setup. The common workaround is: echo 0 > /sys/devices/virtual/net/br0/bridge/multicast_snooping which immediately makes IPv6 work well again. IPv6 unicast is unaffected; only multicast (ie., ND) seems to have the problem. -- You are receiving this mail because: You are the assignee for the bug.