nix-networkd offers a set of options to quickly configure network interfaces with systemd-networkd and nftables, with inspiration from OpenWrt.

Its features include:

1. Create a Bridge, VLAN or XFRM interface.
2. Create a WAN interface using either DHCP or PPPOE, with IPv6 support.
3. (Optionally) Update DDNS on WAN IP changes.
4. Create interface-scoped firewall rules.

For a real-world example, see how it's used in my Nix configs.

• Better DDNS support
• Multi-WAN support