vrrp not working with use_vmac, and a partial solution

I've been trying to get vrrp working using use_vmac, and with
vmac_xmit_base not set.

The problem I've been seeing is that the instance of keepalived in
backup mode is not receiving any packets from the network. As a
consequence it times out, enters master mode and sends an advert. The
real master sees the advert, and forces a new election since it has
received a lower prio advert. The keepalived that should be the backup
(but is now in master mode) now receives the higher priority advert, and
drops back to backup mode. This cycle continues indefinitely.

In trying to find out why keepalived is able to receive while it is in
master mode, but not in backup mode, one difference that occurred to me
was that in master mode, and also if not using use_vmac, the interface
will have an IP address, whereas in backup mode with use_vmac, the
interface does not have an IP address. I manually added a (random) IP
address to the macvlan interface, and it started being able to receive
the advertisment packets from the master, and hence remained in backup
mode.

Both tcpdump (in non-promiscuous mode) and dhclient are able to receive
on the macvlan interface when it doesn't have an IP address, so is there
some additional setting that needs to be configured to allow it to
receive when it doesn't have an IP address?

Quentin Armitage

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