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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.