A blast from the past is always amusing…
I do enjoy it when I find something I've written that makes me think 'cool!' when I read it again:
This virtual name server node requires some out of the ordinary config to work, due to the way VMWare's switches behave. You'll need to set promiscous mode -> yes in the vDS portgroup config, ensure the kernel patch in /fastnet/data/esx-carp.diff is applied and set net.inet.carp.drop_echoed=1 in /etc/sysctl.conf if you want CARP to behave as it should.