IPv6 forwarding

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kunago

New Member
Nov 17, 2020
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I am trying to set up the IPv6 forwarding. I indeed read through forum and searched online but anything I tried don't let me set it right.
I have a public IPv4 (single IP) and IPv6 (/121 range) on the main PROXMOX server, then I created an LXC container, which I can access by IPv4 using forwarding, however, IPv6 cannot.

I have this setup:

PROXMOX SERVER

Code: 
cat /etc/network/interfaces

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        address X.X.X.X/24
        gateway X.X.X.1

        post-up echo 1 > /proc/sys/net/ipv4/ip_forward

iface eth0 inet6 static
        address XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:0/48
        gateway XXXX:XXXX:XXXX::1
        autoconf 0
        dns-nameservers 2606:4700:4700::1111 2606:4700:4700::1001 1.1.1.1 1.0.0.1

        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

        # LXC
        post-up ip neigh add proxy XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:3 dev vmbr0
        post-up ip route add XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:3 dev eth0
        post-down ip route del XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:3 dev eth0
        post-down ip neigh del proxy XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:3 dev vmbr0

auto vmbr0
iface vmbr0 inet static
        address 172.17.250.1/24
        bridge-ports none
        bridge-stp off
        bridge-fd 0
        network 172.17.250.0

        post-up iptables -t nat -A POSTROUTING -s 172.17.250.0/24 -o eth0 -j MASQUERADE
        post-down iptables -t nat -D POSTROUTING -s 172.17.250.0/24 -o eth0 -j MASQUERADE

        post-up iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 2222 -j DNAT --to-destination 172.17.250.2:22
        post-down iptables -t nat -D PREROUTING -i eth0 -p tcp --dport 2222 -j DNAT --to-destination 172.17.250.2:22

iface vmbr0 inet6 static
        address XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:1/48

        post-up ip route add XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:7f dev vmbr0
        post-up ip route add default via XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:7f
        post-down ip route del default via XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:7f
        post-down ip route del XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:7f dev vmbr0


LXC CONTAINER

Code: 
cat /etc/network/interface

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        address 172.17.250.2/24
        gateway 172.17.250.1

iface eth0 inet6 static
        address XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:3/121
        gateway XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:0

        autoconf 0
        dns-nameservers 2606:4700:4700::1111 2606:4700:4700::1001 1.1.1.1 1.0.0.1

I will be glad for any help.
 
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