Tune IPv6 VPN connection
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OpenVPN server should listen on both IPv4 and IPv6 by default proto udp6
/proto tcp6
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OpenVPN client should should not enforce IPv4/IPv6 (#18) -
However, to take advantage of dual stack connection, one should have to configure DNS name of the router/VPN server (turris/reforis/reforis-openvpn#22 (closed)) -
Also check whether some firewall rules is not missing (I am not able to configure working IPv6 VPN server)