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A method and system for dynamically updating information registered in ARP cache tables of other terminals in a case where a protocol address of a terminal existing in an ad hoc network changes.
The method includes detecting whether protocol addresses of terminals are duplicated and changing the protocol addresses of some of the terminals having the duplicate protocol addresses; by a terminal whose protocol address has changed, transmitting information on the previously used protocol address and its own hardware address to neighboring terminals; updating the address information tables in accordance with the received information; by a terminal whose protocol address has not changed among the terminals having the duplicate protocol addresses, transmitting its own address information to the neighboring terminals; and by the neighboring terminals that has received the address information in the fourth step, updating the address information tables in accordance with the received information.
Since ARP cache tables are not updated even when IP addresses are changed due to IP address collision, however, there may occur a case where the changed network situation is not reflected.
In such a case, communications cannot be made between existing terminals and the terminals whose IP addresses have been changed.
However, in a MANet, duplicate IP address assignment may occur in the process of automatic IP address assignment.The Information Science Institute in the University of Southern California in U. Thus, more detailed contents on ARP can be obtained from the website “For example, RFC826 and RFC1868 include contents related to general ARP and Un ARP, respectively.The present invention addresses the aforementioned problem.An aspect of the present invention is to dynamically update ARP cache tables by causing a terminal whose IP address remains unchanged to send its own address information to existing terminals using gratuitous ARP.
The time period required for updating the ARP cache tables is not specified as a standard, but the time period is within a range of 2 minutes to 4 hours.