Researches on extended dynamic process resolution protocol that can traverse NAT

As the security measures against threads such as illegal access, etc. it is useful to define and from communication groups in order to make communications secure. IPsec is not appropriate in the case where system configurations frequently change like intranets, because the management loads on the network manager is quite large. To solve this problem, we have been proposing dynamic process resolution protocol (DPRP), by which devices in the network learn changes in system configurations automatically, and maintain communication groups. However, the conventional DPRP is not applicable when a network address translator (NAT) exists on the way of the communication path. In this paper, we have studied the extended DPRP that can traverse NAT.