linux-kernel - Re: Creating virtual interface triggers an IGMPv3 Join to Multicast DNS

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Message-Id: <6CADE9C0-2EE3-4404-B33B-0941533933D2@mac.com>
Date:	Tue, 7 Aug 2007 00:30:36 -0400
From:	Kyle Moffett <mrmacman_g4@....com>
To:	Adam M <lkml@...tas.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Creating virtual interface triggers an IGMPv3 Join to Multicast DNS

On Aug 06, 2007, at 19:37:47, Adam M wrote:
> Hi folks,
>
> For some reason, every time I create a virtual interface (using  
> tun), the interface immediately generates an IGMPv3 Join packet for  
> group 224.0.0.251, which (according to Google) is Multicast DNS.
>
> This packet is generated automatically and consistently. I'm  
> wondering why this should be the case, and if it can be disabled.

You don't happen to be running "avahi" or one of the other Zeroconf/ 
Bonjour/Rendezvous/$P2P_BUZZWORD_OF_THE_WEEK local-network-discovery  
daemons, do you?  Most of those keep an eye out for new network  
interfaces and automatically start pushing multicast packets down  
them as soon as they appear, which is the most likely explanation for  
what you are seeing; as opposed to a kernel issue.

Cheers,
Kyle Moffett

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