[Qemu-devel] Qemu Multicast Implementation

[Qemu-devel] Qemu Multicast Implementation

[Andres E. Rodriguez Lazo]

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Hello Qemu Developers.

Here at work we're implementing qemu mcast networking while using
avahi-autoipd to obtain network address. The implementation of qemu
networking is the following:

*-net nic,vlan=1,macaddr=52:54:00:12:34:01,model=virtio -net
socket,vlan=1,mcast=230.0.0.1:1234*

So, while running avahi-autoipd we get his messages:
*
[root@localhost ~]# avahi-autoipd eth1*
*Found user 'avahi-autoipd' (UID 499) and group 'avahi-autoipd' (GID 499).
Successfully called chroot().
Successfully dropped root privileges.
Starting with address 169.254.2.176
Callout BIND, address 169.254.2.176 on interface eth1
Received conflicting normal ARP packet.
Callout CONFLICT, address 169.254.2.176 on interface eth1
Trying address 169.254.189.32
Callout BIND, address 169.254.189.32 on interface eth1
Received conflicting normal ARP packet.*

After sniffing ARP packets, we've realized that we're getting ARP packets
back, which screws with autoipd. I think this is due to the mcast
implementation not doing RPF. Is your mcast implementation supposed to do
RPF?? If it is, we've got ourselves a bug.

Thanks for your help,

Look forward to hear from you.


-- 
Andres E. Rodriguez Lazo (4nDr3s - RoAkSoAx)
Ubuntu Counter Project - User # 17582

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