dhcpd6.machines is broken

[ajs124]

Describe the bug DHCPv6 works (slightly) differently from v4 and is also configured (slightly) differently from it. Namely, the configuration defined here is wrong. hardware ethernet cannot be matched, because DHCPv6 does not provide it. fixed-address should also be fixed-address6.

To Reproduce Steps to reproduce the behavior:

1. Try to use dhcp6.machines
2. Observe dhcp6.service failing to start.

Expected behavior I did not expect DHCPv6 to work this way. We cannot fix that, though. In my (short) research, I also did not find an easy way to match for the hardware address and instead opted to use the clients' host names.

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute:
# a list of nixos modules affected by the problem
module:
- dhcp6

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