| 摘要 |
<P>PROBLEM TO BE SOLVED: To resolve an interruption problem from a LAN side terminal under a NAT device to a WAN side terminal not under the NAT device without complicating transfer processing of an existing router when a condition of return communication in the NAT device is satisfied in an IPv6 multi-prefix environment. <P>SOLUTION: A NAT device 5 has a NAT table 14 storing a correspondence of address conversion between a LAN side and a WAN side of an IPv6 global address allocated to terminals A and B of a LAN 3 under the NAT device 5. In the case that the NAT device 5 receives from the LAN side a packet addressed to a destination having a WAN side prefix, whether or not return communication of the packet should be performed is determined based on the NAT table 14. When the packet is a target packet of the return communication, NAT processing is performed to the destination address, and then, the packet is transmitted to a terminal C that belongs to a WAN side communication network 2 not under the NAT device 5. <P>COPYRIGHT: (C)2013,JPO&INPIT |
