[Users] Guest to guest multicast

[Yedidyah Bar David]

Hi,

----- Original Message -----
> From: "Frank Wall" <fw at moov.de>
> To: users at ovirt.org
> Sent: Friday, September 6, 2013 8:05:21 PM
> Subject: [Users] Guest to guest multicast
> 
> Hi,
> 
> I'm trying to use the VRRP protocol between two VMs, but the multicast
> traffic never gets through. On the oVirt host I can see the VRRP
> advertisements coming in for both VMs:
> 
> aio:~# tcpdump -n -X -i vnet3 net 224.0.0.0/4
> listening on vnet3, link-type EN10MB (Ethernet), capture size 65535
> bytes
> 18:58:31.841220 IP 10.1.2.3 > 224.0.0.18: VRRPv2, Advertisement, vrid 1,
> prio 0, authtype none, intvl 1s, length 36
> 
> aio:~# tcpdump -n -X -i vnet8 net 224.0.0.0/4
> listening on vnet8, link-type EN10MB (Ethernet), capture size 65535
> bytes
> 19:02:26.907054 IP 10.1.2.4 > 224.0.0.18: VRRPv2, Advertisement, vrid 1,
> prio 100, authtype none, intvl 1s, length 36
> 
> 
> What is required to enable guest-to-guest multicast communication on an
> oVirt node?

Are they on the same virtual network/bridge?
Did you check iptables? You can add a rule to log such things and see if
it was iptables that blocked it (or something else). Check both host and VMs.
-- 
Didi