Communication system, wireless device, and program for wireless device

A wireless device which is provided between first and second networks and is wirelessly connected to a wireless terminal provided in the first network, the wireless device comprising:

• 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;
• a communication unit configured to send a router advertisement to the wireless terminal with a hop limit set to the maximum number of hops in the first network;
• and
• a hop limit rewriter configured to, when the wireless device receives a communication packet transmitted from the first network to the second network, set the hop limit in the communication packet to the maximum number of hops in the second network, and when the wireless device receives a communication packet sent from the second network to the first network, set the hop limit in the communication packet to the maximum number of hops in the first network, wherein
• the communication unit forwards the communication packets with the hop limit set by the hop limit rewriter.

A wireless device which is wirelessly connected to a wireless base apparatus provided between first and second networks and is provided in the first network, the wireless device comprising:

• a hop limit setter configured to, when the wireless device receives a hop limit included in a router advertisement sent from the wireless base apparatus, set the received hop limit;
• a communication packet generator configured to generate a communication packet including the hop limit set by the hop limit setter;
• and
• a communication unit configured to send the communication packet;
• wherein
• the wireless device further includes a route generator configured to acquire the number of hops from other wireless devices adjacent thereto to the wireless base apparatus in the first network and generates a route so that the number of hops from the wireless device itself and the wireless base apparatus does not exceed the hop limit set by the hop limit setter.