| 摘要 |
<p>A transmission bandwidth is prevented from being greatly lower than a contract bandwidth in circumstances such as a WAN in which an RTT is large, the number of hoppings is large, and thus there are many locations where discarding occurs in the communication using the TCP. A device disposed in a line part from a LAN to a WAN includes a plurality of cards each of which includes a TCP converter relaying two TCP communications. The TCP converter includes means for exchanging information of the number of connections in which data transmission is in progress and the number of connections in which data reception is in progress between TCP converters in the device, means for calculating a total number thereof, means for receiving information of a total number of connections in which data reception is in progress in an opposite device and an access line bandwidth to a WAN from the opposite device for each TCP connection, and means for determining a control bandwidth on the basis of a retransmission ratio of data, a total number of the number of connections in which data transmission is in progress and an access line bandwidth to the WAN of the self device, and a total number of the number of connections in which data reception is in progress and an access line bandwidth to the WAN of which the opposite device notifies.</p> |
