Local network connecting system local network connecting method and mobile terminal

• US 20060153211A1
• Filed: 01/13/2006
• Published: 07/13/2006
• Est. Priority Date: 01/13/2005
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Fujino, Shozo
• Granted Patent: US 8,265,084 B2
• Time in Patent Office: Days
• US Class Current: 370/401
• CPC Class Codes: H04L 12/2856 Access arrangements, e.g. Internet access asynchronous transfer mode networks H04L12/5601; broadband local area networks H04L12/2801; optical access or distribution networks H04Q11/0067; access to open networks H04L12/5691; digital subscriber line end-user equipment and bit-level processing of data on a PSTN-based network H04M11/00; home network gateways H04L12/2834; wireless access networks H04W
• CPC Class Codes: H04L 12/4641 Virtual LANs, VLANs, e.g. virtual private networks [VPN] LAN interconnection over a bridge based backbone H04L12/462; encapsulation techniques H04L12/4633; routing of packets H04L45/00; packet switches H04L49/00; virtual private networks for security H04L63/0272
• CPC Class Codes: H04L 61/2535 Multiple local networks, e.g. resolving potential IP address conflicts
• CPC Class Codes: H04L 61/35 involving non-standard use of addresses for implementing network functionalities, e.g. coding subscription information within the address or functional addressing, i.e. assigning an address to a function
• CPC Class Codes: H04L 61/5046 Resolving address allocation conflicts; Testing of addresses testing when self-assigning an address H04L61/5092
• CPC Class Codes: H04L 61/5061 Pools of addresses
• CPC Class Codes: H04L 61/5084 Providing for device mobility network addressing or numbering for mobility support in wireless networks H04W8/26; mobile IP H04W80/04

Abstract

A local network connecting system includes a first local network, a second local network, a mobile terminal. The first local network is connected with a gateway and a first server assigned with a first local address. The second local network is connected with a second server. The mobile terminal VPN “Virtual Private Network”-connect to the second server through the first local network. The gateway provide mapping of local address for a terminal connected to the first local network. When a packet is sent to the first server from mobile terminal, the mobile terminal assigns a second local address unused over the VPN-connection to a destination address of the packet instead of the first local address, and transmits the packet to the gateway. The gateway translate the second local address into the first local address as destination address of the packet, and transmits the packet to the first server based on the translated destination.

Claims

1. A local network connecting system comprising:

a first local network comprising a first server assigned with a first local address;

a second local network comprising a second server;

a mobile terminal; and

a gateway connected to said first local network,

wherein said mobile terminal assigns a second local address unused over a VPN “

Virtual Private Network”

to a destination address of a packet, transmits said packet to said gateway, wherein said VPN is established between said mobile terminal and said second server through said first local network, and

said gateway translates said second local address into said first local address as said destination address of said packet, and transmits said packet to said first server based on said translated destination address.

2. The local network connecting system according to claim 1, further comprising:

a DHCP (Dynamic Host Configuration Protocol) server connected to said second local network, and assigns an address pool unused over said VPN to said mobile terminal,

wherein said gateway sends said first local address to said mobile terminal,

said mobile terminal acquires said second local address from said unused address pool, generates an address table describing a relation of said second local address and said first local address, and sends said address table to said gateway,

said mobile terminal assigns said second local address to a destination address of the packet based on said address table, and transmits said packet to said gateway, and

said gateway translates said second local address into said first local address as said destination address of said packet based on said address table, and transmits said packet to said first server based on said translated destination address.

3. The local network connecting system according to claim 2, said mobile terminal connected to said gateway, acquires the number of in-use addresses over said first local network from said gateway, and transmits said number to said DHCP server through said VPN,

said DHCP server assigns said number of local address spaces unused over said VPN to said mobile terminal, and

said mobile terminal acquires said second local address from said unused address pool based on said local address space, generates an address table describing a relation of said second local address and said first local address, and sends said address table to said gateway,

4. The local network connecting system according to claim 2, further comprising:

plural mobile terminals,

wherein said gateway acquires address tables describing relation of said second local address and said first local address from said plural mobile terminals, generates an address table list describing relations of said address tables and said plural mobile terminals,

each of said plural mobile terminal assigns said second local address to the destination address of the packet based on said address table, and transmits said packet to said gateway, and

said gateway translates said second local address into said first local address as a destination address of said packet based on said address table associated with a source mobile terminal of said packet, and transmits said packet to said first server based on said translated destination.

5. The local network connecting system according to claim 2,

said gateway transmits a packet received from said mobile terminal to said second server thorough said VPN, when a destination address of said packet assigned with address of said second server.

6. The local network connecting system according to claim 1,

said mobile terminal accesses said gateway as a portal, when said mobile terminal accesses said first local network.

7. A mobile terminal comprising:

an address table database;

a transmission and reception processor; and

a transmission and reception unit,

wherein said address table database stores an address table describing a relation of a first local address using over a first local network and a second local address unused over VPN “

Virtual Private Network”

connected to a second local network through said first network,

said transmission and reception processor assigns said second local address to a destination address of a packet based on said address table, and

said transmission and reception unit transmits said packet to said first server via a gateway, that translates said second local address into said first local address as a destination address of said packet, in said first local network.

8. The mobile terminal according to claim 7, further comprising:

a connecting section; and

an address table generator, wherein said connecting section VPN—

connects to DHCP “

Dynamic Host Configuration Protocol”

server in said second local network, and

said address table generator acquires an address pool unused over said VPN from said DHCP server through said VPN, and generate an address table describing a relation of a second local address acquired from said unused address pool and said first local address.

9. The mobile terminal according to claim 7,

said transmission and reception processor assigns a local address of said second server to the destination of a packet, and

said transmission and reception unit transmits said packet to said second server through said VPN via said gateway.

10. A gateway connected to a first local network which is a route of VPN “

Virtual Private Network”

established between a mobile terminal and a second local terminal, wherein said gateway comprising;

an address table list database;

a mapping section; and

a transmission and reception unit,

wherein said address table list database stores an address table list describing a relation of said first local address using over said first local network and said second local address unused over said VPN,

a mapping section translates said second local address into said first local address as destination address in a packet received from said mobile terminal based on said address table list, and

said transmission and reception unit transmits said packet to the first server based on said translated destination address.

11. The gateway according to claim 10, further comprising:

an address information database;

an address management section; and

an address table list generator,

wherein said address information database stores the number of in-use local address over said first local network,

said address management section sends said number to a terminal through said VPN, and

said address table list generator acquires an address table describing a relation of said first local address and a local address unused over said VPN from a terminal, and generates an address table list describing a relation of said address table and said terminal.

12. A method of connecting a mobile terminal to a local network, comprising:

transmitting a packet destined to a first server from a mobile terminal to a gateway, wherein said gateway is provided for a second local network, said first server is provided for a first local network, assigned with a first local address, and said packet has a second address unused over VPN “

Virtual Private Network”

established between said mobile terminal and said gateway through said first local network;

said gateway translating said second local address into said first local address as destination address of said packet; and

transmitting said packet from said gateway to said first server based on said translated destination address.

13. The method according to claim 12, further comprising:

acquiring the number of in-use local address over said first local network from said gateway;

acquiring an address pool unused over said VPN as many as said number; and

said mobile terminal acquiring said second local address based on said address pool.

14. The method according to claim 12, further comprising:

acquiring a second local address unused over said VPN from said second local network;

generating an address table describing a relation of said first local address and said second local address;

accessing said gateway as a portal in said first local network;

transmitting said address table to said gateway from said mobile terminal;

generating an address table list describing a relation of said address table and said mobile terminal;

said mobile terminal assigning said second local address to destination address of said packet based on said address table;

said gateway translating said second local address into said first local address as a destination address of said packet based on said address table; and

said gateway transmitting said packet to said first server based on said translated destination address.

15. A computer-readable medium comprising code that, when executed, causes a computer to perform the following:

acquiring a first local address in-use local address over a first local network;

acquiring a second local address unused over a VPN “

Virtual Private Network”

being through said first local network;

generating an address table list describing a relation of said second local address and said first local address;

transmitting said address table to a portal gateway in said first local network;

transmitting a packet destined to said first server, wherein said transmitting a packet comprising;

assigning said second local address to a destination address of a packet; and

transmitting said packet to said first server via a gateway that translates said second local address into said first local address as a destination address of said packet in said first local network.

16. The computer-readable medium according to claim 15, further comprising code that, when executed, causes a computer to perform the following:

assigning a local address using said VPN to a destination address of a packet; and

transmitting said packet to said VPN via a gateway in said first local network.

17. A computer-readable medium comprising code on a that, when executed, causes a computer to perform the following:

relating a first local address using over a first local network and a second address unused over VPN “

Virtual Private Network”

being through a first local network;

translating said second local address into said first local address, when a destination address of received packet is said second address; and

a transmitting said packet to first server in said first local network based on said translated destination address.

18. The computer-readable medium according to claim 17, further comprising code that, when executed, causes a computer to perform the following:

transmitting said packet to a second server through said VPN, based on a destination address of received packet assigned with said second server.