Data relay device, data transmission device, and network system

A data relay device configured to relay a message transmitted from a source node from a first network to a second network in a middle of a passage through which the message is transferred to a destination node in a network system constructed with a plurality of kinds of networks having different protocols, the data relay device comprising:

• a first port to which the first network is connected;
• a second port to which the second network is connected;
• and
• a relay section configured to convert a first frame received from a first node on the first network through the first port into a data format pursuant to the protocol of the second network, and to transmit a post-conversion second frame to a second node on the second network through the second port, wherein
• the first frame comprises a data structure in which a first header portion pursuant to the protocol of the first network is added to a data portion comprising common routing information and the message,
• the common routing information comprises route information identifying all nodes through which the message is routed from the source node to the destination node, and
• the relay section
• recognizes that a next destination is the second node on the second network by referring to the common routing information acquired from the data portion of the first frame,
• generates a second header portion pursuant to the protocol of the second network, and
• replaces information identifying the second node that is of a next destination in the route information comprised in the common routing information with information identifying an own node that is of a return address, and generates the second frame by adding the generated second header portion to the data portion comprising the common routing information and the message.

A data transmission device connected to a network system constructed with a plurality of kinds of networks having different protocols to transmit a message to a destination node, the data transmission device comprising:

• a storage section in which network configuration information is stored, all networks and nodes constituting the network system being defined in the network configuration information;
• a common routing information generation section configured to refer to the network configuration information to generate common routing information comprising route information identifying all the nodes through which the message is routed from an own node to the destination node;
• a frame generation section configured to generate a frame comprising a data structure in which a header portion pursuant to the protocol of the network between the own node and an initial relay node is added to a data portion comprising the common routing information and the message transmitted to the destination node;
• and
• a transmission section configured to transmit the frame to the relay node after replacing information identifying the relay node that is of a next destination in the route information comprised in the common routing information with information identifying the own node that is of a return address.

A program configured to cause a data relay device, which is arranged in a middle of a passage through which a message transmitted from a source node is transferred to a destination node in a network system constructed with a plurality of kinds of networks having different protocols to comprise a first port connected to a first network and a second port connected to a second network, to execute relay processing of converting a first frame received from a first node on the first network through the first port into a data format pursuant to the protocol of the second network, and of transmitting a post-conversion second frame to a second node on the second network through the second port, wherein

• the first frame comprises a data structure in which a first header portion pursuant to the protocol of the first network is added to a data portion comprising common routing information and the message,
• the common routing information is information identifying all nodes through which the message is routed from the source node to the destination node, and
• the relay processing comprises:
• processing of recognizing that a next destination is the second node on the second network by referring to the common routing information acquired from the data portion of the first frame;
• processing of generating a second header portion pursuant to the protocol of the second network;
• and
• processing of replacing information identifying the second node that is of a next destination in the route information comprised in the common routing information with information identifying an own node that is of a return address, and of generating the second frame by adding the generated second header portion to the data portion comprising the common routing information and the message.

A program configured to cause a data transmission device, which is connected to a network system constructed with a plurality of kinds of networks having different protocols to transmit a message to a destination node, to act as:

• a storage section in which network configuration information is stored, all networks and nodes constituting the network system being defined in the network configuration information;
• a common routing information generation section configured to refer to the network configuration information to generate common routing information comprising route information identifying all the nodes through which the message is routed from an own node to the destination node;
• a frame generation section configured to generate a frame comprising a data structure in which a header portion pursuant to the protocol of the network between the own node and an initial relay node is added to a data portion comprising the common routing information and the message transmitted to the destination node;
• and
• a transmission section configured to replace information identifying the relay node that is of a next destination in the route information comprised in the common routing information with information identifying the own node that is of a return address, and to transmit the frame to the relay node.