common/lan-discovery.nix


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# LAN reachability and mDNS discovery shared by all machines.
{ ... }:

{
  # Allow IPv4 ICMP echo requests so hosts can be found with ping.
  networking.firewall.allowPing = true;

  # Avahi/mDNS: publish <hostname>.local and resolve other *.local LAN names.
  # Keep the multicast DNS firewall opening scoped to the Wi-Fi LAN interface.
  networking.firewall.interfaces.wlp8s0.allowedUDPPorts = [ 5353 ];
  services.avahi = {
    enable = true;
    nssmdns4 = true;
    openFirewall = false;
    allowInterfaces = [ "wlp8s0" ];
    publish = {
      enable = true;
      addresses = true;
      workstation = true;
    };
  };
}