{
    return "" unless (defined $GatewayIP && (
                        ($SystemMode eq 'serveronly' && $InternalInterface{Name} eq $THIS_DEVICE ) ||
                        ($ExternalInterface{Name} eq $THIS_DEVICE) ));
    $OUT .= "$GatewayIP dev $THIS_DEVICE\n";
    $OUT .= "default via $GatewayIP dev $THIS_DEVICE\n";
}
