Re: Serving IPV6 from a remote host
By: Nigel Reed to Fidonet.IPV6 on Tue Jan 07 2025 01:10 am

I've played around with Wireguard quite a bit. I'm definitely not a total expert on it or IPv6 but do have IPv6 working on my home network.

During my initial foray into Wireguard, I found that for IPv4, Wireguard doesn't work on Layer 2 where the broadcasts that DHCP needs would exist. IPv6 replaced broadcasts with multicast, which are still Layer 2 and most of the autoconfiguration of IPv6 relies on it, including RA/RS messages, SLAAC and DHCPv6.
So I *think* you can make a Wireguard tunnel with IPv4 on the outside and 2 interfaces with IPv6 on the inside, you'll just have to assign the "inside" wgX addresses manually. E.g. fd77::1/64 and fd77::2/64. You might need to add fe80:: addresses manually as well.

OpenVPN does work on Layer 2 if you use tap mode (Wireguard is like OpenVPN in tun mode), and DHCPv4 will definitely cross it if you have the tap junctioned into a bridge that a physical NIC is part of. I got a Windows file share working over an Internet connection with it once. I haven't played with IPv6 over OpenVPN yet.
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