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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


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:


These are the IPv6 Nameservers from Google but you can use different ones.

If you run:


You should get a response and you should be able to reach your VM under this IPv6 which you configured earlier.

Sources used:

proxmox_ipv6.txt · Last modified: 2021/09/03 12:32 by neoon