I see, thank you. Unfortunately I don't have IPv6 on my network and don't know the IPv6 local addresses and ip6tables config, if you could give me the actual config you used I'd appreciate it, especially if it works with both IPv4 and IPv6 together.

Sure

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[Interface] Address = 172.16.31.1/24 Address = 2001:__::1/64 PrivateKey = __ ListenPort = 443

[Peer] PublicKey = __ PresharedKey = __ AllowedIPs = 172.16.31.2/32, 2001:__::2/128

[Peer] PublicKey = __ PresharedKey = __ AllowedIPs = 172.16.31.3/32, 2001:__::3/128

[...]

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PostUp = iptables -A FORWARD -i %i -j ACCEPT; iptables -A FORWARD -o %i -j ACCEPT; iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE; ip6tables -A FORWARD -i %i -j ACCEPT; ip6tables -A FORWARD -o %i -j ACCEPT PostDown = iptables -D FORWARD -i %i -j ACCEPT; iptables -D FORWARD -o %i -j ACCEPT; iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE; ip6tables -D FORWARD -i %i -j ACCEPT; ip6tables -D FORWARD -o %i -j ACCEPT

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[Interface] Address = 172.16.31.2/24 Address = 2001:__::2/64 PrivateKey = __ DNS = 172.16.31.1, 2001:__::1 [Peer] PublicKey = __ PresharedKey = __ AllowedIPs = 0.0.0.0/0, ::/0 Endpoint = <server_ip>:443 PersistentKeepalive = 25

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This is extremely helpful, thanks!