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fix NIC naming: use udev rules instead of .link files

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systemd.network.links didn't generate files; use udev extraRules
to pin NIC names to MACs. Also disable networking.useDHCP catch-all
that silently misconfigured the LAN NIC when it got a wrong name.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
rope 2026-05-22 09:27:10 +01:00
parent 94d5b6a2a1
commit 8560c11afa
2 changed files with 9 additions and 15 deletions
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2
hosts/FredOS-Mediaserver.nix
View file

@ -29,7 +29,7 @@
]; ];
# Basic networking # Basic networking
networking.useDHCP = lib.mkDefault true; networking.useDHCP = lib.mkForce false;
# Allow fred to act as a remote Nix builder (trusted users can import # Allow fred to act as a remote Nix builder (trusted users can import
# unsigned store paths sent by the build client). # unsigned store paths sent by the build client).

22
services/router.nix
View file

@ -72,23 +72,17 @@ in
"net.ipv6.conf.all.disable_ipv6" = 1; "net.ipv6.conf.all.disable_ipv6" = 1;
}; };
# --- Interface configuration ---
systemd.network = {
enable = true;
# Pin interface names to MAC addresses so they never swap across boots. # Pin interface names to MAC addresses so they never swap across boots.
# Without this, "eth0" is an unpredictable kernel name that depends on # Without this, "eth0" is an unpredictable kernel name that depends on
# device probe order — if the NICs swap, the entire LAN/WAN config breaks. # device probe order — if the NICs swap, the entire LAN/WAN config breaks.
links = { services.udev.extraRules = ''
"10-wan" = { SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="6c:0b:84:0c:4c:58", NAME="eth0"
matchConfig.MACAddress = "6c:0b:84:0c:4c:59"; SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="6c:0b:84:0c:4c:59", NAME="eno1"
linkConfig.Name = "eno1"; '';
};
"20-lan" = { # --- Interface configuration ---
matchConfig.MACAddress = "6c:0b:84:0c:4c:58"; systemd.network = {
linkConfig.Name = "eth0"; enable = true;
};
};
networks = { networks = {
"10-wan" = { "10-wan" = {