netbirdio/netbird · error

failed to parse MTU: %w

Error message

failed to parse MTU: %w

What it means

Error "failed to parse MTU: %w" thrown in netbirdio/netbird.

Source

Thrown at client/iface/freebsd/iface.go:84

		}

		// If line contains "inet ", it's a line with IP address
		if strings.Contains(line, "inet ") {
			parts := strings.Fields(line)
			if len(parts) < 2 {
				return nil, fmt.Errorf("failed to parse line: %s", line)
			}
			ips = append(ips, parts[1])
		}
	}

	if name == "" {
		return nil, fmt.Errorf("interface name not found in ifconfig output")
	}

	mtuInt, err := strconv.Atoi(mtu)
	if err != nil {
		return nil, fmt.Errorf("failed to parse MTU: %w", err)
	}

	return &iface{
		Name:    name,
		MTU:     mtuInt,
		Group:   group,
		IPAddrs: ips,
	}, nil
}

func parseIFName(output []byte) (string, error) {
	// TODO: implement without allocations
	lines := strings.Split(string(output), "\n")
	if len(lines) == 0 || lines[0] == "" {
		return "", fmt.Errorf("no output returned")
	}

	fields := strings.Fields(lines[0])

View on GitHub (pinned to 93e97f4bf1)

When it happens

Trigger: Thrown at client/iface/freebsd/iface.go:84 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

AI-assisted analysis of netbirdio/netbird@93e97f4bf1 (2026-08-16). Data as JSON: /api/errors/a9cf72c7a8bb1d34. Report an issue: GitHub.