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> Disable IPv6: this approach relies on ARP, which IPv6 doesn't use

This makes me kind of sad. Even if it’s just for a private/local usage. IPv6 has the features of ARP built in via “neighborhood discovery protocol” (NDP) with the addition of various security to prevent spoofing.

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The OP relies on ARP spoofing, so I don't think NDP would work.

I thought you could run IPv4 and IPv6 at the same time, or am I missing something?

You can but the issue is that if the caller _thinks_ it can reach it over IPv6 it'll never send the IPv4 unicast packet which means the server won't wake.

Yes, and you can do the same for IPv6 using any ND proxy server.

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