From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Bauer Subject: ip link macvtap interface not processing specific ipv6 multicast traffic without promiscuous mode on Date: Thu, 09 Apr 2015 12:09:27 +0200 Message-ID: <1428574167.2171.32.camel@plzk.de> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit To: netdev@vger.kernel.org Return-path: Received: from smtprelay02.ispgateway.de ([80.67.31.29]:57031 "EHLO smtprelay02.ispgateway.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934530AbbDIKNc (ORCPT ); Thu, 9 Apr 2015 06:13:32 -0400 Received: from [91.47.193.61] (helo=zarafa) by smtprelay02.ispgateway.de with esmtpsa (TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256) (Exim 4.84) (envelope-from ) id 1Yg9Oq-0007vj-Q1 for netdev@vger.kernel.org; Thu, 09 Apr 2015 12:09:28 +0200 Received: from s1 (unknown [192.168.0.151]) by zarafa (Postfix) with ESMTP id A5538220064 for ; Thu, 9 Apr 2015 12:09:27 +0200 (CEST) Sender: netdev-owner@vger.kernel.org List-ID: Hi, Linux s1 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt7-1 (2015-03-01) x86_64 GNU/Linux 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10) The following interface (created by kvm/qemu virtualization) 7: macvtap0@eth0: mtu 1500 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 500 link/ether 52:54:00:76:c1:f0 brd ff:ff:ff:ff:ff:ff is not processing multicast traffic for ipv6 to specific addresses. My virtual machines get router&prefix correct but can not resolve addresses - hence are not able to communicate with other machines. If i put the interface in promiscuous mode the neighbor tables of other hosts are instantly filled. Without: 2a01:198:200:8350:98ec:1708:c82e:a4fb dev br-lan INCOMPLETE With: 2a01:198:200:8350:98ec:1708:c82e:a4fb dev br-lan lladdr 52:54:00:8e:b9:eb REACHABLE Any ideas on this? Cheers, Stefan