ipv4 & ipv6 Virtual Hosting - address in use

[petteyg359]

ipv6only=on seems to behave the opposite of what it should. I have a
default_server listening on all interfaces. It works fine using
listen [::]:80 default_server;
listen 80 default_server;

but if I do
listen [::]:80 default_server ipv6only=on;
listen 80 default_server;

then I get a bunch of errors about already bound addresses on startup.
net.ipv6.bindv6only is set to 1.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,154862,161268#msg-161268