Computer network address mapping

An apparatus comprising:

• a remote network coupled with a local network;
• a portable device coupled with the remote network for generating an initial data packet having a source header of a first point of the local network, and destined for a local device coupled to a second point of the local network;
• a local controller;
• a remote controller for generating from the initial data packet at least one subsequent data packet destined for the local controller and including a data message that encapsulates addresses of the first and second points of the local network;
• including:
• a comparator of data message length to a value;
• and
• a fragmenter of the data message into an initial portion and a remainder portion if the data message length is greater than the value.

A method comprising:

• providing a local network and a local controller coupled with a remote network and a remote controller;
• providing a portable device coupled with the remote and a local device coupled with the local network;
• using the portable device to generate an initial data packet, having a source header of a first point of the local network, and destined for the local device coupled to a second point of the local network;
• using the remote controller to generate from the initial data packet at least one subsequent data packet, destined for the local controller and including a data message that encapsulates addresses of the first and second points of the local network;
• comparing length of the data message to a value;
• and
• generating one subsequent data packet if the length of the data message is less than the value;
• and
• generating two subsequent data packets if the length of the data message is greater than the value.