Communication system, wireless device, and program for wireless device

摘要

An edge router 12 sends a router advertisement to wireless terminals 11 to notify the wireless terminals 11 of the hop limit. Each wireless terminals 11 stores the notified hop limit in the hop limit field of an IPv6 packet. The edge router 12 stores the maximum number of hops in the user's home system 1 and the maximum number of hops in the IP network NW. When receiving a communication packet sent from the user's home system 1 to the IP network NW, the edge router 12 sets the hop limit in the communication packet to the maximum number of hops in the IP network NW. When receiving a communication packet sent from the IP network NW to the user's home system 1, the edge router 12 sets the hop limit in the communication packet to the maximum number of hops in the user's home system 1.

主权项

1. A communication system, comprising:
a first wireless device provided between a first network and a second network; and a second wireless device which is provided for the first network and is wirelessly connected to the first wireless device, wherein the first wireless device includes: a storage unit configured to store the maximum number of hops in the first network and the maximum number of hops in the second network; and a first communication unit configured to send a router advertisement to the second wireless device with a hop limit set to the maximum number of hops in the first network, and the second wireless device includes: a hop limit setter configured to, when the second wireless device receives the hop limit included in the router advertisement sent from the first wireless device, set a hop limit to the received hop limit; a communication packet generator configured to generate a communication packet including the set hop limit; and a second communication unit configured to send the communication packet, the first wireless device further includes a hop limit rewriter configured to, when the first wireless device receives the communication packet sent from the first network to the second network, set the hop limit in the received communication packet to the maximum number of hops in the second network and, when the first wireless device receives a communication packet transmitted from the second network to the first network, set a hop limit in the received communication packet to the maximum number of hops in the first network, and the first communication unit forwards the communication packets with the hop limit set by the hop limit rewriter.