INFORMATION COMMUNICATION SYSTEM, INFORMATION COMMUNICATION APPARATUS AND METHOD, AND COMPUTER PROGRAM

摘要

An information communication system, information communication device and method, and a computer program are provided to properly transmit IP packets in an IP network having a limited number of router hops. Information communication devices exchange IP packets through an IP network. When a control value having a predetermined number of router hops or a predetermined packet exchange procedures limited not to be greater than the control value is performed, each information communication device monitors TTL(Time-To-Live) values designated in headers of IP packets received during a time interval starting from when the predetermined packet exchange procedure starts to immediately when the predetermined packet exchange procedure is terminated, continuously updates the maximum TTL value among monitored TTL values, and checks whether the maximum TTL value does not exceed the control value.