I have OpenVPN installed on my Ubuntu 14.04 VPS with IPv6 access. I would like to have a proper dual stack configuration working. I can connect to my OpenVPN server's public IPv4 address: get private IPv4 and public IPv6 assigned to me, and have full IPv4 and IPv6 connectivity working through the VPN (checked with test-ipv6.com).
Problem is, if I connect to the server's IPv6 address (I have IPv6 on my ISP connection), I am able to successfully connect to it and get IPv4 and IPv6 addresses assigned but unable to get any sort of connectivity going, not even ping to any internal or external IP or host including the server's private IPv4 address in the tunnel. I have enabled IPv4 and IPv6 forwarding in /etc/sysctl.conf.
I am unsure what is going on. Help is very much appreciated.
IP info (masked):
- VPS IPv4 address (device: eth0): 107.xxx.xxx.xxx
- VPS IPv6 subnet (device: he-ipv6): 2001:xxx:xxxx::/48
- OpenVPN IPv4 subnet: 10.8.0.0/24
- OpenVPN IPv4 private address: 10.8.0.1
- OpenVPN IPv4 client addresses: 10.8.0.2, 10.8.0.3, [...]
- OpenVPN IPv6 subnet: 2001:xxx:xxxx:xxx::/64
- OpenVPN IPv6 server address: 2001:xxx:xxxx:xxx::1/64
- OpenVPN IPv6 client addresses: 2001:xxx:xxxx:xxx::1000/64, 2001:xxx:xxxx:xxx::1001/64, [...]
port 443 proto tcp6 dev tun sndbuf 0 rcvbuf 0 ca ca.crt cert server.crt key server.key dh dh.pem tls-auth ta.key 0 topology subnet server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt push "redirect-gateway def1 bypass-dhcp" push "dhcp-option DNS 126.96.36.199" push "dhcp-option DNS 188.8.131.52" keepalive 10 120 cipher AES-128-CBC comp-lzo user nobody group nogroup persist-key persist-tun status openvpn-status.log verb 3 crl-verify crl.pem tun-ipv6 push tun-ipv6 server-ipv6 2001:xxx:xxxx:xxx::/64 push "redirect-gateway-ipv6 def1 bypass-dhcp-ipv6" push "route-ipv6 2001:xxx:xxxx:xxx::/64" push "route-ipv6 2000::/3"
client dev tun sndbuf 0 rcvbuf 0 ;remote 107.xxx.xxx.xxx 443 tcp # IPv4 (disabled; full IPv4 and IPv6 connectivity when connected) remote 2001:xxx:xxxx:xxx::1 443 tcp6 # IPv6 (enabled; no connectivity when connected) resolv-retry infinite nobind persist-key persist-tun remote-cert-tls server cipher AES-128-CBC comp-lzo setenv opt block-outside-dns key-direction 1 verb 3 <ca> </ca> <cert> </cert> <key> </key> <tls-auth> </tls-auth>