From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Greear Subject: Re: GRE devices and MULTICAST flag. Date: Fri, 23 Sep 2011 13:42:53 -0700 Message-ID: <4E7CEF4D.6080309@candelatech.com> References: <4E7CE473.3000304@candelatech.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: netdev Return-path: Received: from mail.candelatech.com ([208.74.158.172]:56422 "EHLO ns3.lanforge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751933Ab1IWUmx (ORCPT ); Fri, 23 Sep 2011 16:42:53 -0400 Received: from [192.168.100.111] (firewall.candelatech.com [70.89.124.249]) (authenticated bits=0) by ns3.lanforge.com (8.14.2/8.14.2) with ESMTP id p8NKgrhO032124 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 23 Sep 2011 13:42:53 -0700 In-Reply-To: <4E7CE473.3000304@candelatech.com> Sender: netdev-owner@vger.kernel.org List-ID: On 09/23/2011 12:56 PM, Ben Greear wrote: > I was under the impression that GRE tunnels could support MULTICAST > traffic, but the MULTICAST flag is not set. This is making the xorp > router crap out because it checks the MULTICAST flag and will > not start multicast on the interface if it's not set.... > > Is it supposed to be set? > > 7: gre0: mtu 1476 qdisc noqueue state UNKNOWN > link/gre 0.0.0.0 brd 0.0.0.0 > 8: netb: mtu 1476 qdisc noqueue state UNKNOWN > link/gre 192.168.100.223 peer 192.168.100.138 > inet 10.0.1.1/32 scope global netb Well, ifconfig netb multicast seems to add the flag, so maybe all is as it should be. Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com