[Users] Multicast issue with openvz VMs and CTs

[jjs - mainphrame]

I've been doing some testing with ucarp, in debian VMs and containers.

(ucarp is an implementation of VRRP, a means of providing a highly
available floating virtual IP within a cluster of machines)

It works fine on proxmox VMs and CTs, and I was hoping to get it working on
openvz, but so far my attempts to get it fully up and running have failed.

Basically, both nodes become master, because neither node is seeing the
multicast traffic from the other.

What is the secret of allowing multicast traffic to pass from openvz VMs
and CTs, onto the lan?

Jake
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