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networking: pin defaultGateway to eth0 (fixes no-default-route on 25.05+)
Since NixOS 25.05, scripted networking installs the default route from the
gateway interface's network-addresses-<iface>.service, matching the interface
via defaultGateway.interface or by subnet inclusion. Hetzner's off-subnet
point-to-point gateway (91.98.47.73/32 on eth0, gw 172.31.1.1) matched
neither with the bare-string form, so the 26.05 switch on 2026-08-03 left the
host with no default route and off the network (recovered via Hetzner rescue:
grubenv default back to the 24.11 generation).

With an explicit interface, the module installs both the gateway host route
and the default route from eth0's own unit:
  ip -4 route replace 172.31.1.1 proto static dev eth0
  ip -4 route replace default proto static dev eth0 via 172.31.1.1

Verified by nix eval of systemd.services.network-addresses-eth0.script.
2026-08-03 20:13:24 +00:00
..