US6633571B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
VPN composing method, interwork router, packet communication method, data communication apparatus, and packet relaying apparatus
Assignee: Hitachi Ltd
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Filing: 1999-09-09
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Granted: 2003-10-14
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Expires: 2019-09-09
Abstract
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.
Inventors
- 👤 Kenichi Sakamoto
- 👤 Kazuyoshi Hoshino
- 👤 Koji Wakayama
- 👤 Shiro Tanabe
- 👤 Noboru Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:42
CPC Classifications
H; H04; H04L; H04L45/00; H04L45/50; H04L12/00; H04L12/28; H04L12/2854; H04L12/2856; H04L12/2869; H04L12/287; H04L12/2874; H04L12/46; H04L12/4633; H04L12/4641
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
133 words
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.
Claim 2
Dependent Claim
133 words
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.
Claim 3
Dependent Claim
18 words
A packet communication method according to claim 1 , wherein the packet is an IP (Internet Protocol) packet.
Claim 4
Dependent Claim
23 words
A packet communication method according to claim 2 , wherein IP encapsulation is used in the step of generating a second capsule header.
Claim 5
Dependent Claim
123 words
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.
Claim 6
Dependent Claim
123 words
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.
Claim 7
Dependent Claim
18 words
A packet communication apparatus according to claim 4 , wherein the packet is an IP (Internet Protocol) packet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-10-13 | 2007-04-14 | 2007-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-10-13 | 2011-04-14 | 2011-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-10-13 | 2015-04-14 | 2015-10-14 | $7700.00 | Window Closed / Lapsed |