VPN composing method, interwork router, packet communication method, data communication apparatus, and packet relaying apparatus
AssigneeHitachi, Ltd.
InventorsKenichi Sakamoto, Kazuyoshi Hoshino, Koji Wakayama, Shiro Tanabe, Noboru Endo
Life of this patent
Estimating the term…
Abstract
A method serves to compose a VPN (Virtual Private Network) over a plurality networks each of which is managed by different Internet Service Providers (ISP). When a packet with a first capsule header used for composing a VPN in a first ISP network is transmitted to a second ISP network, a route for outputting packet to the second ISP network is determined based on the information both in the capsule header and in the IP header. In addition, a second capsule header used for composing a VPN in the second ISP network is determined based on the above information.
Claims5
A packet communication method of transmitting a packet to which is added a first capsule header used to compose a closed network in a first communication network, the packet having a further header to a second communication network, comprising the steps of:
- receiving the packet;
- generating a capsule header index;
- eliminating the first capsule header;
- adding the capsule header index to the packet;
- retrieving a route to the second network according to an IP address of the received packet and information in the capsule header index;
- and
- generating a second capsule header used to compose a closed network in the second communication network based on information both in the further header and in the capsule header index, whereby a closed network extending the first communication network and the second communication network is composed.
A packet communication apparatus for transmitting a packet to which is added a first capsule header used to compose a closed network in a first communication network, the packet having a further header to a second communication network, comprising:
- means for generating a second capsule header used to compose a closed network in the second communication network from information both in the further header and in the first capsule header;
- means for replacing the first capsule header with the second capsule header;
- and
- means for retrieving a route to the second network according to an IP address of the packet and information in the first capsule header, whereby a closed network extending the first communication network and the second communication network is composed.
Dependencies are inferred from the claim text.