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# LAN reachability and mDNS discovery shared by all machines.
{
config,
lib,
...
}:
let
cfg = config.lanDiscovery;
in
{
options.lanDiscovery.interface = lib.mkOption {
type = lib.types.str;
description = "Wi-Fi LAN interface used for mDNS discovery.";
};
config = {
# 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 host's Wi-Fi LAN interface.
networking.firewall.interfaces.${cfg.interface}.allowedUDPPorts = [ 5353 ];
services.avahi = {
enable = true;
nssmdns4 = true;
openFirewall = false;
allowInterfaces = [ cfg.interface ];
publish = {
enable = true;
addresses = true;
workstation = true;
};
};
};
}
|
