Proxmox + Ovh + LXC IPv6 not working

[Haru]

Hi all,

First post here, i'm facing odd issues with my servers. I installed proxmox zfs 4.4 template from OVH, download LXC centos7 template for proxmox and create LXCs via GUI. Ipv4 work well on all servers, but i have only one server that have IPv6 work inside LXC. I tried many tutorials from internet ( and this forum ) but still no luck, so please guide me if you have time, thank you very much

HOST: IPv6 Work fine

1. nano /etc/network/interfaces

# This file describes the network interfaces available on your system

# and how to activate them. For more information, see interfaces(5).


# The loopback network interface

auto lo

iface lo inet loopback


# for Routing

auto vmbr1

iface vmbr1 inet manual

        post-up /etc/pve/kvm-networking.sh

        bridge_ports dummy0

        bridge_stp off

        bridge_fd 0



# vmbr0: Bridging. Make sure to use only MAC adresses that were assigned to you.

auto vmbr0

iface vmbr0 inet static

        address 217.182.193.xxx

        netmask 255.255.255.0

        network 217.182.193.0

        broadcast 217.182.193.255

        gateway 217.182.193.254

        bridge_ports eth0

        bridge_stp off

        bridge_fd 0


iface vmbr0 inet6 static

        address 2001:41d0:0303:1cxx::

        netmask 64

        post-up /sbin/ip -f inet6 route add 2001:41d0:0303:1cff:ff:ff:ff:ff dev vmbr0

        post-up /sbin/ip -f inet6 route add default via 2001:41d0:0303:1cff:ff:ff:ff:ff

        pre-down /sbin/ip -f inet6 route del default via 2001:41d0:0303:1cff:ff:ff:ff:ff

        pre-down /sbin/ip -f inet6 route del 2001:41d0:0303:1cff:ff:ff:ff:ff dev vmbr0

2. Ping Ipv6 of LXC
ping6 2001:41d0:303:1cxx::1

PING 2001:41d0:303:1cxx::1(2001:41d0:303:1cxx::1) 56 data bytes

64 bytes from 2001:41d0:303:1cxx::1: icmp_seq=1 ttl=64 time=0.037 ms

64 bytes from 2001:41d0:303:1cxx::1: icmp_seq=2 ttl=64 time=0.051 ms

64 bytes from 2001:41d0:303:1cxx::1: icmp_seq=3 ttl=64 time=0.027 ms

^C

--- 2001:41d0:303:1c3b::1 ping statistics ---

3 packets transmitted, 3 received, 0% packet loss, time 1998ms

rtt min/avg/max/mdev = 0.027/0.038/0.051/0.011 ms

3. ping6 -I vmbr0 ff02::2

PING ff02::2(ff02::2) from fe80::a6bf:1ff:fe17:cbb4 vmbr0: 56 data bytes

64 bytes from fe80::2d7:8fff:fea8:f841: icmp_seq=1 ttl=64 time=0.690 ms

64 bytes from fe80::2d7:8fff:fea8:f541: icmp_seq=1 ttl=64 time=1.16 ms (DUP!)

64 bytes from fe80::2d7:8fff:fea8:f841: icmp_seq=2 ttl=64 time=0.711 ms

64 bytes from fe80::2d7:8fff:fea8:f541: icmp_seq=2 ttl=64 time=0.724 ms (DUP!)



LXC: IPv4 Work, IPv6 not
1. Ping gateway work fine:
PING 2001:41d0:303:1cff:ff:ff:ff:ff(2001:41d0:303:1cff:ff:ff:ff:ff) 56 data bytes
64 bytes from 2001:41d0:303:1cff:ff:ff:ff:ff: icmp_seq=1 ttl=64 time=0.728 ms
64 bytes from 2001:41d0:303:1cff:ff:ff:ff:ff: icmp_seq=2 ttl=64 time=0.736 ms
^C
--- 2001:41d0:303:1cff:ff:ff:ff:ff ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.728/0.732/0.736/0.004 ms

2. Ping HOST IPv6 work:
PING 2001:41d0:303:1cxx:2001:41d0:303:1cxx: 56 data bytes
64 bytes from 2001:41d0:303:1cxx::: icmp_seq=1 ttl=64 time=0.025 ms
64 bytes from 2001:41d0:303:1cxx::: icmp_seq=2 ttl=64 time=0.042 ms
^C
--- 2001:41d0:303:1c3b:: ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 0.025/0.033/0.042/0.010 ms

3. Ping Google not work:
PING google.com(par21s11-in-x0e.1e100.net (2a00:1450:4007:80c::200e)) 56 data bytes
^C
--- google.com ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 29999ms

 

[Haru]

Solved, here is solution:

On HOST, add follow line to the end of /etc/sysctl.conf

net.ipv6.conf.default.proxy_ndp=1
net.ipv6.conf.all.proxy_ndp=1
net.ipv6.conf.default.forwarding=1
net.ipv6.conf.all.forwarding = 1