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

From: Kyle Moffett
Date: Tue Aug 07 2007 - 00:30:59 EST


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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/