OpenVPN - IPv6 works only in local network

Hello everyone,

I have dual stack OpenVPN server:

IPv4 works fine, but IPv6 works only in local network. I would like to access the IPv6 Internet through my VPN.

Server eth0 IP: 2a03:b0c0:1:d0::7f:8001/64 Server tun0 IP: 2a03:b0c0:1:d0::7f:8002/64 Client tun0 IP: 2a03:b0c0:1:d0::7f:8003/64



Chain INPUT (policy DROP 240 packets, 19200 bytes)
 pkts bytes target     prot opt in     out     source               destination         
   32  6574 ACCEPT     all      lo     *       ::/0                 ::/0                
  167 14920 ACCEPT     icmpv6   *      *       ::/0                 ::/0                
   36  3242 ACCEPT     udp      *      *       ::/0                 ::/0                 udp dpt:53
    6   481 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:53
    0     0 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:22
    0     0 ACCEPT     tcp      *      *       ::/0                 ::/0                 tcp dpt:1194
  246 28608 ACCEPT     all      *      *       ::/0                 ::/0                 state RELATED,ESTABLISHED

Chain FORWARD (policy ACCEPT 15 packets, 1560 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 569 packets, 91798 bytes)
 pkts bytes target     prot opt in     out     source               destination  


mode server
proto tcp-server
dev tun0
topology subnet

ifconfig-ipv6 2a03:b0c0:1:d0::7f:8002 2a03:b0c0:1:d0::7f:8001
client-config-dir /etc/openvpn/ccd


ifconfig-push # vps
ifconfig-ipv6-push 2a03:b0c0:1:d0::7f:8003/64

push "route-ipv6 2a03:b0c0:1:d0::7f:8001/64"
push "route-ipv6 2000::/3"





remote 1194
proto tcp
dev tun1
proto tcp-client
remote-cert-tls server


Both server & client configs


keepalive 10 30


verb 2

Do you have any idea what is wrong? Thanks you for your help!

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In CCD do

iroute-ipv6 2a03:b0c0:1:d0::7f:8001/64 iroute-ipv6 2000::/3

instead of push “route-ipv6 2a03:b0c0:1:d0::7f:8001/64” push “route-ipv6 2000::/3”

This comment has been deleted

Okay, I solved this problem. Tested on clean OpenVPN installed by that tutorial:

We need to create another subnet(?) for OpenVPN, so in /etc/openvpn/server.conf add: server-ipv6 ANY_IP_V6::/112

I used my server IP replacing two colons in it for one and adding at the end :80::/112

Now create rule: ip6tables -t nat -A POSTROUTING -s YOUR_ANY_IP_V6/112 -j SNAT --to YOUR_SERVER_IP

And remember, in /etc/sysctl.conf uncomment: net.ipv6.conf.all.forwarding = 1

Restart, reconnect and check This site shows problem with big MTU, but I don’t know now how to solve it

BTW sorry for my bad english.