Proxy-less packet routing between private and public address realms

• US 20020116502A1
• Filed: 02/22/2001
• Published: 08/22/2002
• Est. Priority Date: 02/22/2001
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Warrier, Ulhas S., Iyer, Prakash N.
• Granted Patent: US 7,437,474 B2
• Time in Patent Office: Days
• US Class Current: 709/227
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/2514 between local and global IP addresses
• CPC Class Codes: H04L 61/2546 Arrangements for avoiding unnecessary translation

Abstract

Routing packets of information without proxies over a network having both private and public networks includes reviewing the destination address of a packet received a private network interface and rerouting the packet to a private client connected to the private network interface when the destination address of the packet is the public address of the private network.

Claims

1. A network gateway to route a packet, comprising:

a public network interface having a public address;

a private network interface having a private address; and

a processor that reviews a destination address of the packet received at the private network interface and routes the packet to a private client connected to the private network interface when the destination address of the packet corresponds to the public address of the gateway.

2. The gateway of claim 1, wherein the processor routes the packet based on a private address of the private client reserved in a mapping table.

3. The gateway of claim 1, further comprising a memory that stores a mapping table for routing the packet.

4. The gateway of claim 3, wherein the processor searches for the private address of the private client in the mapping table.

5. The gateway of claim 4, wherein the processor executes instructions to drop the packet when the private address of the private client is not found in the mapping table.

6. The gateway of claim 1, wherein the processor routes the packet without routing the packet to a public network.

7. The gateway of claim 1, further comprising:

a memory that stores a protocol stack;

wherein the processor routes the packet up the stack when the destination address of the packet is the private address of the gateway.

8. The gateway of claim 1, wherein the processor executes instructions to route the packet to a public network connected to the public network interface when the destination address of the packet is not the public address of the gateway, the private address of the gateway, or a private address of a private client connected to the private network interface.

9. A method, performed by a network gateway, to route a packet, comprising:

reviewing a destination address of a packet received at a private network interface of the gateway; and

routing the packet to a private client connected to the private network interface of the gateway when the destination address of the packet corresponds to a public address of the gateway.

10. The method of claim 9, wherein the gateway routes the packet based on a private address of the private client reserved in a mapping table.

11. The method of claim 10, further comprising searching for the private address of the private client in the mapping table.

12. The method of claim 11, further comprising causing the gateway to drop the packet when the private address of the private client is not found in the mapping table.

13. The method of claim 9, wherein routing occurs without routing the packet to a public network.

14. The method of claim 9, wherein the gateway routes the packet up a protocol stack when the destination address of the packet is a private address of the gateway.

15. The method of claim 9, wherein the gateway routes the packet to a public network connected to a public network interface of the gateway when the destination address of the packet is not the public address of the gateway, the private address of the gateway, or a private address of a private client connected to the private network interface of the gateway.

17. The article of claim 16, further comprising instructions for causing the machine to route the packet based on a private address of the private client reserved in a mapping table.

18. The article of claim 17, further comprising instructions for causing the machine to search for the private address of the private client in the mapping table.

19. The article of claim 18, further comprising instructions for causing the machine to drop the packet when the private address of the private client is not found in the mapping table.

20. The article of claim 16, further comprising instructions for causing the machine to route the packet without routing the packet to a public network.

21. The article of claim 16, further comprising instructions for causing the machine to route the packet through a protocol stack when the destination address of the packet is a private address of the gateway.

22. The article of claim 16, further comprising instructions for causing the gateway to route the packet to a public network connected to a public network interface of the gateway when the destination address of the packet is not the public address of the gateway, the private address of the gateway, or a private address of a private client connected to the private network interface of the gateway.

24. The system of claim 23, wherein the system routes the packet based on a private address of the private client reserved in a mapping table.

25. The system of claim 23, wherein the system routes the packet to a public network client when the destination address of the packet is not the public network interface of the gateway, the private network interface of the gateway, or a private client of the gateway.

16. An article comprising:

a machine-readable medium that stores instructions for use in routing a packet, the instructions for causing the machine to;

review a destination address of a packet received at a private network interface of the gateway; and

route the packet to a private client connected to the private network interface of the gateway when the destination address of the packet corresponds to a public address of the gateway.

23. A system over which packets are transported, comprising:

a private network;

a public network; and

a gateway between the private and public network, wherein the system reviews a destination address of a packet received at a private network interface of the gateway and routes the packet to a private client connected to the private network interface when the destination address of the packet is a public address of the gateway.