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Fix TAP interfaces stuck in "configuring" by enabling ConfigureWithoutCarrier

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When a VM is not running, its TAP interface has no carrier, so networkd
refuses to assign static addresses (hostAddress) and the link gets stuck
in "configuring" state. This causes systemd-networkd-wait-online to block
for 2 minutes. Setting ConfigureWithoutCarrier=yes lets networkd assign
addresses immediately regardless of carrier state.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Davíð Steinn Geirsson 2026-03-08 01:17:49 +00:00
parent 0a07f7f14e
commit ebf28dfc00
1 changed files with 6 additions and 2 deletions
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8
modules/networking.nix
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@ -69,8 +69,11 @@ in
# Configure vmsilo TAP/bridge network units:
# - Not required for online (VMs may not be running during nixos-rebuild)
# - No IPv6 autoconfiguration (prevents "configuring" stuck state and
# unwanted host addresses on VM-to-VM interfaces)
# - ConfigureWithoutCarrier: assign static addresses even when link has no
# carrier (VM not running), so networkd reaches "configured" state
# immediately instead of getting stuck in "configuring"
# - No IPv6 autoconfiguration (prevents unwanted host addresses on
# VM-to-VM interfaces)
systemd.network.networks =
let
bridgedTaps = builtins.filter (
@ -79,6 +82,7 @@ in
bridgeNames = lib.unique (map (t: t.iface.tap.bridge) bridgedTaps);
unitConfig = {
linkConfig.RequiredForOnline = "no";
networkConfig.ConfigureWithoutCarrier = true;
networkConfig.IPv6AcceptRA = false;
networkConfig.LinkLocalAddressing = "no";
};