This is an old revision of the document!
If you have a Kimsufi Dedicated, you got a full /64 not just /128 which is a single IP, lets use it.
First we need to enable Forwarding on the Node in: /etc/sysctl.conf
net.ipv6.conf.all.forwarding=1 net.ipv6.conf.default.forwarding=1 net.ipv6.conf.all.proxy_ndp=1
Add this to the bottom on the file.
Next, we need to add IPv6 to our vmbr2, which the VM should be connected to.
iface vmbr2 inet6 static
address 2601:xxxx:xx:xxx::2
netmask 64
bridge_ports none
bridge_stp off
bridge_fd 0
post-up echo 1 > /proc/sys/net/ipv6/conf/all/proxy_ndp
post-up echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
post-up echo 1 > /proc/sys/net/ipv6/conf/default/forwarding
post-up /sbin/ip -f inet6 neigh add proxy 2601:xxxx:xx:xxx::2 dev vmbr2
post-up /sbin/ip -f inet6 neigh add proxy 2601:xxxx:xx:xxx::3 dev vmbr0
post-up /sbin/ip -f inet6 route add 2601:xxxx:xx:xxx::3 dev vmbr2
The next thing you need to do, restart your network on your Dedi with:
service networking restart
Now Login into your VM and add this to your /etc/network/interfaces:
iface eth0 inet6 static
address 2601:xxxx:xx:xxx::3
netmask 64
gateway 2601:xxxx:xx:xxx::2
Restart your Networking on the VM:
service networking restart
If it dosen't respond after a while, try to Reboot your VM over Proxmox. Now we still need to add IPv6 DNS Server to our /etc/resolv.conf:
2001:4860:4860::8888 2001:4860:4860::8844
These are the IPv6 Nameservers from Google but you can use different ones.
If you run:
ping6 google.com
You should get a response and you should be able to reach your VM under this IPv6 which you configured earlier.
Sources used: http://hw7.net/?p=252