As is common with other networking services, stopIfChanged=true (the default) can cause O(seconds) downtime during activation. Reduce this downtime by disabling stopIfChanged as done in: * sshd https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/networking/ssh/sshd.nix#L569 * tailscale https://github.com/NixOS/nixpkgs/pull/170210