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MDNS service discovery with VETH interface [message #13740] Mon, 04 June 2007 14:09 Go to previous message
Daniel Pittman is currently offline  Daniel Pittman
Messages: 26
Registered: January 2007
Junior Member
G'day. I have a VE that I set up using a VETH interface rather than a
VENET interface so I could test ZeroConf service discovery and other
broadcast/multicast protocols.

I have the VETH device bridged with the physical Ethernet device on the
hardware node and can see standard broadcast packets without any

I don't see the multicast packets cross the interface boundary though;
it is my belief that the VETH device doesn't correctly handle the
packets being sent to the Ethernet MAC '01:00:5e:00:00:fb'

This is running kernel '2.6.18-028stab033.1-ovz'

Have I missed some critical step in getting multicast services working
with the VETH device or so?

I think, reading the veth.c source, that the problem is in the veth_xmit
function on line 305 in the current HEAD in get -- the code tests:

if (!is_broadcast_ether_addr(((struct ethhdr *)skb->data)->h_dest)) {

This should probably also pass a multicast packet through to the VE, not
just the broadcast packets. That way multicast traffic is seen inside
the system.

The appropriate test would be 'is_multicast_ether_addr(...)' in addition
to the broadcast.

I have not supplied a patch here because I don't know what, if any,
extra implications permitting multicast packets in have -- or if there
is some other mechanism that I have missed that would cause them to pass
through as expected.

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