My current situatuion is that i want to use IPv6 but currently don't have any IPv6 address assigned. But I have a server with a dual stack interface including a public IPv4 and IPv6 address (only a /128 subnet). So I thought: Hey, wouldn't it be nice to make use of the server's IPv6 capability?
For the first time I set up a OpenVPN server which routes all my IPv4 traffic through a IPv4 tunnel. That worked well. After that I googled a lot and tried to find a solution for my need to route all IPv6 traffic through this tunnel. I found a lot of tutorials showing how to assign a new IPv6 address from a own subnet to each user connecting to the OpenVPN server. But unfortunately I do only have one IPv6 address: the one for my server which is not in my LAN (because they are a precious thing for the hoster of my server, you know...). I tried to apply NAT for my only IPv6 address analogously as for my IPv4 address afterwards, but failed with that...
port 1194 proto tcp dev tun ca ca.crt cert server.crt key server.key dh dh2048.pem server 10.8.0.0 255.255.255.0 server-ipv6 fe80::/64 ifconfig-pool-persist ipp.txt push "route 192.168.0.0 255.255.255.0" push "route-ipv6 2000::/3" push "redirect-gateway def1 bypass-dhcp" push "redirect-gateway ipv6" push "dhcp-option DNS 188.8.131.52" push "dhcp-option DNS 184.108.40.206" keepalive 10 120 tls-auth ta.key 0 key-direction 0 cipher AES-128-CBC # AES auth SHA256 comp-lzo user openvpn group openvpn persist-key persist-tun status openvpn-status.log verb 3
iptables -t nat -A POSTROUTING -s 10.0.0.0/8 -o ens3 -j MASQUERADE ip6tables -t nat -A POSTROUTING -s fe80::/64 -o ens3 -j MASQUERADE