US 2009/0022161 A1 · COMMUNICATION SYSTEM AND COMMUNICATION NODE

Abstract

A technique is disclosed, by which it is possible to identify a communication node having special function under the condition that a certain communication node knows only the address of a communication node having no special function. According to this technique, a first communication node 10 having a first function (e.g. the mounting of IPv6 and ICMPv6) and a second function (e.g. the mounting of NSIS) transmits a search packet by an echo request packet of ICMPv6 with the purpose of searching a communication node having the first function and the second function to a second communication node 20 having only the first function. The second communication node sends back a response packet to this by an echo response packet of ICMPv6. A communication node 15 having the first function and the second function and being the first receiver of this response packet grasps that own communication node is the search object of the first communication node. Also, by the search packet, desired information can be offered from the first communication node to the communication node of the search object.

Claims23

Dependent claims

A communication system, comprising at least a first communication node, having a first function to realize transfer of a packet, and a second function, being an additional function different from said first function, and a second communication node having said first function, and said first communication node grasps address of said second communication node, wherein:

said first communication node transmits a search packet to said second communication node for the purpose of searching a communication node having said first function and said second function;
said second communication node transmits a response packet including said predetermined information in response to the receiving of said search packet;
and
a third communication node, having said first function and said second function and being a first receiver of said response packet, grasps that it is a search object of said first communication node upon receipt of said response packet.

1 more element

A communication node having a first function to realize transfer of packet and having a second function being an additional function different from said first function, wherein said communication node comprises:

address grasping means for grasping address of a predetermined communication node having said first function;
searching means for generating and transmitting a search packet having address of said predetermined communication node as destination address with the purpose of searching a communication node having said first function and said second function;
and
address acquiring means for acquiring address of a communication node having said first function and said second function by receiving a notifying packet containing the address of a communication node having said first function and said second function, said communication node being the first receiver of a response packet transmitted as a response to said search packet by said predetermined communication node, or by receiving said response packet containing the address of the communication node having said first function and said second function, said communication node being the first receiver of said response packet.

1 more element

packet transfer means for transferring a packet;
and
response packet detecting means for grasping that own communication node is a search object of said first communication node by detecting a response packet to the search packet, said search packet being transmitted from a first communication node to a second communication node with the purpose of searching a communication node having said first function and said second function.

Dependencies are inferred from the claim text.

Communication system and communication node

Life of this patent

Communication system and communication node

Life of this patent

Abstract

Claims23