[SOLVED] KVM and delayed multicast joins

Hi all,

I have a KVM host and a guest both running 12.04 LTS.

At startup, a user process joins a multicast group.

When I start the process manually, I can see the multicast join packets sent when the socket is created.
When I reboot the guest OS, the process is restarted, and I can also see the join packets sent immediately.

The strange thing is that when I reboot the host, the guest is restarted automatically, the user process is also started, but the multicast join packets are not sent immediately.
I have to wait for up to 3-4 minutes to see them with wireshark.

Do you have any idea ?

Thanks...