Dynamic system and method for virtual private network (VPN) application level content routing using dual-proxy method

• US 20080144625A1
• Filed: 12/14/2006
• Published: 06/19/2008
• Est. Priority Date: 12/14/2006
• Status: Active Grant

• Current Assignee: Array Networks Incorporated (Hitachi, Ltd.)
• Original Assignee: Array Networks Incorporated (Hitachi, Ltd.)
• Inventors: Wu, Michael, Yen, Leemay, Chang, Arthur, Hsu, Nai-Ting
• Granted Patent: US 7,852,861 B2
• Time in Patent Office: Days
• US Class Current: 370/392
• 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 45/04 Interdomain routing, e.g. hierarchical routing
• CPC Class Codes: H04L 45/306 Route determination based on the nature of the carried application

Abstract

A method of application level content routing using a (Dynamic VPN) dual-proxy mechanism that provides a client access to resources on a remote network without exposing each other'"'"'s actual IP addresses and network topologies. The method includes providing a client a list of available resources on a remote network; initiating a request by the client for at least one resource from the list of available resources hosted on the remote network as though the at least one resource is local to the client; routing the request to the at least remote resource through a secure connection between the client and the remote network; responding to the request by the at least remote resource as though the request is initiated locally on the remote network; and routing the response from the remote network back to the client through the secure connection.

Claims

1. A method of application level content routing using a Dynamic VPN (DVPN) dual-proxy mechanism comprising:

providing at least one client on a first virtual private network node a list of available resources hosted on a second virtual private network node;

initiating a request by the at least one client for at least one resource from the list of available resources hosted on the second virtual private network node as though the at least one resource is local to the at least one client without exposing an actual IP addresses of the list of available resources on the second virtual private network node;

routing the request to the at least one resource through a secure connection between the first virtual private network node and the second virtual private network node;

responding to the request by the at least one resource on the second virtual private network node as though the request is initiated locally on the second virtual private network node without exposing an actual IP address of the at least one client on the first virtual private network node; and

routing the response from the second virtual private network node back to the at least one client on the first virtual private network node through the secure connection.

2. The method of claim 1, wherein the secure connection between the at least one client and the at least one resource is established between a first virtual private network gateway on the first virtual private network and a second virtual private network gateway on the second virtual private network node.

3. The method of claim 1, further comprising a first DVPN proxy server on the first virtual private network node and a second DVPN proxy server on the second virtual private network node.

4. The method of claim 3, wherein the first and second DVPN proxy servers are independent servers.

5. The method of claim 3, wherein the first and second DVPN proxy servers are independent servers on an associated virtual private network gateway.

6. The method of claim 3, wherein the at least one resource on the second virtual private network node is provisioned to the first DVPN proxy server, and a local IP address and/or a local name on the first virtual private network node is assigned to the at least one resource.

7. The method of claim 6, wherein the local IP address on the first node of the at least one resource is obtained using an IP pool of addresses configured on a first virtual private network gateway on the first virtual private network node.

8. The method of claim 6, wherein the local IP address on the first node of the at least one resource is obtained using a DHCP server on the first virtual private network node.

9. The method of claim 6, wherein a domain name system (DNS) server is used to provide the at least one client with the local IP address on the first virtual private network node when the at least one client is requesting the at least one resource by name.

10. The method of claim 3, wherein the first DVPN proxy server acts as a virtual resource which is on the second virtual private network node, for the at least one client on the first private network node after provisioning, and further wherein the first DVPN proxy server can receive the request to access the at least one resource from the at least client using the local IP address on the first private virtual private network node.

11. The method of claim 3, wherein the secure connection comprises establishing a virtual private network (VPN) Control Tunnel and at least one virtual private network (VPN) Session Tunnel.

12. The method of claim 11, wherein the initial request is communicated via the virtual private network (VPN) Control Tunnel from the first DVPN proxy server to the second DVPN proxy server.

13. The method of claim 3, wherein the second DVPN proxy server has a local IP address on the second virtual private network node for the at least one client on the first virtual private network node, and wherein the local IP address on the second virtual private network node of the at least one client is obtained using an IP pool of addresses configured on a second virtual private network gateway on the second virtual private network node or a DHCP server on the second virtual private network node.

14. The method of claim 3, wherein the second DVPN proxy server initiates the request on behalf of the at least one client to the at least one resource on the second private network node.

15. The method of claim 11, wherein the first and the second DVPN proxy servers establish the virtual private network (VPN) Session Tunnel after processing the initial request from the at least one client to the at least one resource between the first and the second DVPN proxy servers via the virtual private network (VPN) control tunnel.

16. The method of claim 11, wherein the first and the second DVPN proxy servers route data exchange between the at least one client and the at least one resource via the virtual private network (VPN) Session Tunnel using an unique session identifier which is created based on a client name, a resource name and an IP addresses on the second virtual private network node.

17. The method of claim 11, wherein the first and the second DVPN proxy servers close and remove the virtual private network (VPN) Session Tunnel when the at least one client and the at least one resource finish their data exchange.

18. The method of claim 1, further comprising an authentication and authorization system, wherein the authentication and authorization system authenticates and authorizes each access request.

19. The method of claim 11, wherein the first and second DVPN proxy servers create a plurality of virtual private network Session Tunnels from an initial virtual private network Session Tunnel to support application protocols that use a plurality of IP (Internet Protocol) ports.

20. The method of claim 3, wherein the first and the second DVPN proxy servers perform content re-write to map embedded IP addresses and port numbers on the first and second virtual private network nodes to support an application protocol.

21. The method of claim 1, wherein the at least one client accesses the at least one resource through a plurality of intermediate virtual private network nodes with a DVPN proxy server in each of the plurality of intermediate virtual private network nodes.

22. The method of claim 1, wherein the at least one client comprises a plurality of clients on the first network node, and wherein the plurality of clients access a plurality of resources on the second virtual private network node.

23. The method of claim 1, wherein the first virtual private network node is configured to host a plurality of local resources, which are accessible by at least one client on the second virtual private network node.