code: public static KNXNetworkLinkIP newRoutingLink(final NetworkInterface netIf, final InetAddress mcGroup,
  		final KNXMediumSettings settings) throws KNXException
  	{
  		return new KNXNetworkLinkIP(ROUTING, new KNXnetIPRouting(netIf, mcGroup), settings);
  	}
docs: Creates a new network link using the {@link KNXnetIPRouting} protocol, with the local endpoint specified by a
  network interface.
  
  @param netIf local network interface used to join the multicast group and for sending, use <code>null</code> for
  the host's default multicast interface
  @param mcGroup address of the multicast group to join, use {@link #DefaultMulticast} for the default KNX IP
  multicast address
  @param settings medium settings defining device and medium specifics needed for communication
  @return the network link in open state
  @throws KNXException on failure establishing link using the KNXnet/IP connection