permanent neighbour/ARP tables entries

This example configures an neighbour entry on a physical link:

  • add an ipv4 and address
  • set the link state to up
  • add static ARP entry
interfaces:
  eth0:
    addresses:
      - 192.0.2.1/24
    link:
      kind: physical
      state: up
    neighbours:
      192.0.2.42: 42:00:00:00:de:fa

{
  "networking.ifstate" = {
    enable = true;
    settings = {
      interfaces.eth0 = {
        addresses = [ "192.0.2.1/24" ];
        link = {
          kind = "physical";
          state = "up";
        };
        neighbours = { "192.0.2.42" = "42:00:00:00:de:fa"; };
      };
    };
  };
}

ip address add 192.0.2.1/24 dev eth0
ip link set dev eth0 up
ip neigh add 192.0.2.42 lladdr 42:00:00:00:de:fa dev eth0 nud permanent