Got the 6to4 config surviving a reboot: gnixl.com now works if and only if you have ipv6 connectivity.
Here's my config. All you need to do is change the ipv6 (6to4) address for your server if you want to use it on your openvz vhost:
knoppix@Microknoppix:~/tunnel$ cat interfaces.tail.6to4 auto sit0 iface sit0 inet6 manual up ifconfig sit0 up post-up ifconfig sit0 inet6 add 2002:cfd2:53cd::1/16 post-up route -A inet6 add 2000::/3 gw ::192.88.99.1 dev sit0 pre-down route -A inet6 del 2000::/3 gw ::192.88.99.1 dev sit0 pre-down ifconfig sit0 del 2002:cfd2:53cd::1/16 down ifconfig sit0 down
last updated 2013-03-24 00:38:32. served from tektonic.jcomeau.com