Network connecting method and device

A network connecting method in a network connecting device, said network connecting device including:

• first communicating means for performing communications with a first communication network such as a local area network,
• connectionless (CL) communicating means for performing a CL transmission with a second communication networks, and
• connection-oriented (CO) communicating means for performing a CO transmission with a third communication network,
• said network connecting method comprising the steps of:
• storing in first storing means at least a part of protocol control information and communication channel identifying information in a corresponding relationship, the protocol control information being of data on the first communication network, and the communication channel identifying information being for identifying a communication channel with a second, alternatively third wide area communication network, and
• performing channel control for recovering an entry having communication channel identifying information which indicates the CL communicating means as a entry having communication channel identifying information which indicates the CO communication means, by referring to the communication channel identifying information held in the first storing means.

A network connecting device comprising:

• first communicating means for performing communications with a first communication network such as a wide area network;
• connectionless (CL) communicating means for performing CL transmission with a second communication network;
• connection-oriented (CO) communicating means for performing a CO transmission with a third communication network;
• first storing means for storing at least a part of protocol control information and communication channel identifying information in a corresponding relationship, the protocol control information being of data on the first communication network, and the communication channel identifying information being for identifying a communication channel with a second, alternatively third wide area communication network;
• and
• channel control means for changing an entry, which has communication channel identifying information indicating the CO communicating means as a second entry, which has communication channel identifying information indicating the CL communicating means, by referring to the communication channel identifying information held in the first storing means.

A network connecting device comprising:

• first communicating means for performing communications with a first communication network such as a wide area network;
• connectionless (CL) communicating means for performing a CL transmission with a second communication network;
• connection-oriented (CO) communicating means for performing a CO transmission with a third communication network;
• first storing means for holding at least a part of protocol control information and communication channel identifying
• information in a corresponding relationship, the protocol control information being of data on the first communication network, and the communication channel identifying information being for identifying a communication channel with a second, alternatively third wide area network;
• and
• channel control means for recovering an entry, which has communication channel identifying information indicating the CL communicating means, as an entry which has communication channel identifying information indicating the CO communicating means, by referring to the communication channel identifying information held in the first storing means.

A network connecting device comprising:

• first communicating means for performing communications with a first communication network such as a local area network;
• connectionless (CL) communicating means for performing a CL transmission with a second communication network;
• connection-oriented (CO) communicating means for performing a CO transmission with a third communication network;
• first storing means for holding at least a part of protocol control information and communication channel identifying information in a corresponding relationship, the protocol control information being of data on the first communication network, and the communication channel identifying information being used by the CL and CO communicating means;
• second storing means for holding the at least a part of protocol control information and sequence information in a corresponding relationship, the protocol control information being of data on the first communication network, and the sequence information for sequencing;
• channel setting control means for adding a new first entry containing at least a part pf the protocol control information of data on the first communication network to the first storing means, and updating communication channel identifying information of the first entry to one for using the CL communicating means;
• and
• kicking-out means for deciding, among entries using the CO communicating means, an entry to be changed to one for using the CL communicating means by referring to at least a part of protocol control information of a data packet held in the first storing means and the sequence information held in the second storing means, and then updating the communication channel identifying information held in the first storing means to indicate the CL communicating means for the decided entry.