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

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Message-Id: <1186492527.30132.1204156793@webmail.messagingengine.com>
Date:	Tue, 07 Aug 2007 09:15:27 -0400
From:	"Adam M" <lkml@...tas.net>
To:	"Kyle Moffett" <mrmacman_g4@....com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Creating virtual interface triggers an IGMPv3 Join to Multicast DNS

Hi Kyle,

Ah-hah, you nailed it right on the head. I unknowingly had Bonjour
running (must be installed by default on Fedora Core 3), which started a
process 'mDNSResponder'. I'm guessing that's the bugger that's fire off
these multicast joins.

Thanks for the tip!

-Adam


On Tue, 7 Aug 2007 00:30:36 -0400, "Kyle Moffett" <mrmacman_g4@....com>
said:
> 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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