Without this, the default-drop input policy blocked SSH and AdGuard DNS
from existing 192.168.4.x clients because they arrive on eno1 (still
acting as a client on the eero network until phase 2 cutover).
The trustedLegacyCidrs list is meant to be emptied in phase 2 when
eno1 becomes the ISP-facing WAN.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Adds services/router.nix with systemd-networkd (eno1=WAN via DHCP,
eth0=LAN 10.0.0.1/24), nftables (NAT + firewall, default drop on WAN
in), dnsmasq (DHCP only — AdGuard Home keeps :53 for DNS), and sysctl
IP forwarding. NetworkManager is forced off on this host.
Port forwards live in ports.toml at the repo root and are imported via
builtins.fromTOML. Supports single ports, ranges ("26901-26902"), and
"both" protocol. Initial forwards: 22, 80, 443, 26900, 26901-26902.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
