Method and system for domain name resolution in a communications system

• US 7,512,672 B2
• Filed: 12/22/2004
• Issued: 03/31/2009
• Est. Priority Date: 03/19/2004
• Status: Active Grant

• Current Assignee: Gigaset Communications GmbH (Gigaset AG)
• Original Assignee: Gigaset Communications GmbH (Gigaset AG)
• Inventors: Sundarraj, Akkampapet, Hightower, Michael, Pickering, James
• Primary Examiner(s): Hu; Jinsong
• Application Number:
  US11/021,785
• Publication Number:
  US 20050210139A1
• Time in Patent Office: 1,560 Days
• Field of Search: 709/219, 709/227, 709/233, 709/245, 713/1
• US Class Current: 709/219
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/45 Network directories; Name-to-address mapping
• CPC Class Codes: H04L 63/08 for authentication of entities cryptographic mechanisms or cryptographic arrangements for entity authentication H04L9/32

Abstract

A method and system for domain name resolution in a communications network including the steps of intercepting communication to and from the network and replacing DNS primary and DNS secondary IP address by an interceptor program. The interceptor program copies then replaces the IP addresses in messages received from the network to a spoof address so that an alternate application will receive the domain name resolution requests. The interceptor program replaces the IP addresses in messages sent to the network from the spoof address to the copied addresses. The alternate application receives the domain name resolution request and replaces the IP address of the request which is the spoof address to the copied IP addresses. The alternate application sends the domain name resolution requests to the copied IP addresses operatively simultaneously.

Claims

1. A method for resolving a domain name resolution request in a communications system including a data processing system, and a network, comprising:

initializing a PPP (Point-To-Point Protocol) connection between the data processing system and the network for establishing a session;

during said initialization intercepting an IPCP Internet Protocol Control Protocol message containing a DNS (Domain Name Service) server address by an interceptor program, the IPCP message communicated between the data processing system and the network;

copying said DNS server address from said IPCP message, storing said copied DNS server address, and replacing said DNS server address in the IPCP message with an alternative address;

resolving said domain name resolution request by intercepting said request by an alternate application;

substantially simultaneously sending the request to each DNS server for which an address was stored; and

receiving a resolved IP address by said data processing system.

2. The method as claimed in claim 1, wherein the step of initializing a PPP connection further comprising adding intelligent routing information to a route table.

3. The method as claimed in claim 2, further comprising copying the DNS server address into the route table for intelligent routing.

4. The method as claimed in claim 2, further comprising entering in the route table a metric value of 1 for indicating high priority.

5. The method as claimed in claim 2, further comprising entering in the route table an interface for the DNS server address for identifying a session interface.

6. The method as claimed in claim 2, further comprising entering in the route table a gateway IP address for the DNS server address.

7. The system as claimed in claim 2, further comprising entering in the route table a mask of 255.255.255.255 creating a host entry.

8. The system as claimed in claim 1, further comprising connecting the data processing system to multiple sessions.

9. The method as claimed in claim 1, further comprising using the route table by the alternative application to route the requests to the correct session.

10. The method as claimed in claim 1, wherein the alternative address is administrable.

11. The method as claimed in claim 1, wherein an unsolicited DHCP inform message is discarded.

12. The method as claimed in claim 1, wherein the interceptor program and the alternate application are separate programs.

13. The method as claimed in claim 1, wherein the alternate application forwards only a first positive acknowledgement for a request.

14. The method as claimed in claim 1, wherein the alternate application discards only a negative acknowledgement for a request.

15. The method as claimed in claim 1, wherein the IPCP message has a plurality of DNS server addresses, wherein each of the plurality of DNS server addresses is stored and replaced.

16. A system for resolving a domain name resolution request, comprising:

a data processing system and a network;

a plurality of IPCP messages each containing a DNS (Domain Name Service) server address communicated between said data processing system and said network during a PPP (Point-To-Point Protocol) initialization; and

an interceptor program stored on the data processing system, for each IPCP message the interceptor program when executed on a processor the data processing system;

intercepts the respective IPCP message,

stores in the data processing system the DNS server address for the respective IPCP message, and

replaces the DNS server address in the respective IPCP message with an alternative address,

wherein the interceptor program intercepts a domain name resolution request and substantially simultaneously sends said request to each DNS server for which an address was stored.

17. The system as claimed in claim 16, further comprising adding intelligent routing information to a route table.

18. The system as claimed in claim 17, further comprising entering in the route table the DNS server address, a high priority metric value, an interface identifying a session interface, a gateway IP address, and a host entry mask.

19. The system as claimed in claim 16, further comprising connecting the data processing system to multiple sessions.

20. The system as claimed in claim 16, wherein the interceptor program comprises multiple programs.

21. The system as claimed in claim 16, wherein a plurality of domain name resolution requests are sent substantially simultaneously to said network.

22. The system as claimed in claim 16, wherein the respective IPCP message has a plurality of DNS server addresses, wherein each of the plurality of DNS server addresses is stored and replaced.

23. A method for resolving a domain name resolution request in a communications system including a data processing system, and a network, comprising:

by the data processing system;

initializing a Point-To-Point Protocol connection between the data processing system and the network for establishing a session;

during said initialization intercepting a plurality of messages from the network by, each message containing a Domain Name Service server address,

for each message, storing said Domain Name Service server address from the respective message, and replacing said DNS server address in the respective message with an alternative address;

resolving said domain name resolution request by sending the request to said stored addresses substantially simultaneously; and

receiving a resolved IP address.

24. The method as claimed in claim 23, wherein the respective message has a plurality of DNS server addresses, wherein each of the plurality of DNS server addresses is stored and replaced.