making varnish listen ONLY on ipv6

[Paul Mansfield]

I've fiddled with the -a option to see if it will accept an ipv6 address
to force binding only on ipv6, but varnishd didn't like it

Is there a way to do this?

I am testing out various ideas to see how well a pure ipv6 solution
works, so that I can verify my ipv6 test system is working (e.g. DNS
entries with only AAAA records etc).

thanks very much
Paul