netbirdio/netbird · error

set mtu: %w

Error message

set mtu: %w

What it means

Error "set mtu: %w" thrown in netbirdio/netbird.

Source

Thrown at client/iface/device/device_kernel_unix.go:68

func (t *TunKernelDevice) Create() (WGConfigurer, error) {
	link := newWGLink(t.name)

	if err := link.recreate(); err != nil {
		return nil, fmt.Errorf("recreate: %w", err)
	}

	t.link = link

	if err := t.assignAddr(); err != nil {
		return nil, fmt.Errorf("assign addr: %w", err)
	}

	// TODO: do a MTU discovery
	log.Debugf("setting MTU: %d interface: %s", t.mtu, t.name)

	if err := link.setMTU(int(t.mtu)); err != nil {
		return nil, fmt.Errorf("set mtu: %w", err)
	}

	configurer := configurer.NewKernelConfigurer(t.name)

	if err := configurer.ConfigureInterface(t.key, t.wgPort); err != nil {
		return nil, fmt.Errorf("error configuring interface: %s", err)
	}

	return configurer, nil
}

func (t *TunKernelDevice) Up() (*udpmux.UniversalUDPMuxDefault, error) {
	if t.udpMux != nil {
		return t.udpMux, nil
	}

	if t.link == nil {
		return nil, fmt.Errorf("device is not ready yet")

View on GitHub (pinned to 93e97f4bf1)

When it happens

Trigger: Thrown at client/iface/device/device_kernel_unix.go:68 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of netbirdio/netbird@93e97f4bf1 (2026-08-16). Data as JSON: /api/errors/1ca23fa33fd1eb6a. Report an issue: GitHub.