Resolving virtual network names

• US 7,653,747 B2
• Filed: 06/05/2006
• Issued: 01/26/2010
• Est. Priority Date: 10/16/2001
• Status: Expired due to Term

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Nielsen, Henrik Frystyk, Shewchuk, John P., Levin, David E., Lucco, Steven E., Lovering, Bradford H., Christensen, Erik B., Layman, Andrew J.
• Primary Examiner(s): Winder; Patrice
• Assistant Examiner(s): NGUYEN, MINH CHAU
• Application Number:
  US11/422,106
• Publication Number:
  US 20060212599A1
• Time in Patent Office: 1,331 Days
• Field of Search: 709/203
• US Class Current: 709/245
• CPC Class Codes: H04L 45/02 Topology update or discovery
• CPC Class Codes: H04L 61/4511 using domain name system [DNS]
• CPC Class Codes: H04L 61/4552 Lookup mechanisms between a plurality of directories; Synchronisation of directories, e.g. metadirectories
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]
• CPC Class Codes: H04L 67/563 Data redirection of data network streams
• CPC Class Codes: H04L 67/564 Enhancement of application control based on intercepted application data

Abstract

An apparatus and method is provided for resolving virtual network names using one or more name routers. A conventional Uniform Resource Locator (URL) naming scheme is extended by allowing any component to be mapped to an address. The resolution process occurs recursively through a plurality of name routers. Resolution can be contextual, such that the same virtual network name may be resolved differently depending on the identity of the client or other parameters.

Claims

1. A name router storing a computer programmed with computer-executable instructions that perform the steps of:

(1) receiving a request to route a message to a communication endpoint identified by a virtual name, the name comprising a plurality of individually resolvable discrete name components including a specified host name and at least one other name component;

(2) resolving a portion of the virtual name into an address using a virtual name table that maps virtual name components to addresses, wherein each discrete name component is individually and independently resolvable such that communication endpoint names with the same specified host name and at least one differing name component are resolved to different physical host servers; and

(3) forwarding the message to the resolved address, wherein the resolved address corresponds to another name router.

2. The name router of claim 1, wherein the computer-executable instructions perform step (2) by applying a mapping policy that resolves a given virtual name differently depending on the mapping policy.

3. The name router of claim 2, wherein the computer-executable instructions perform step (2) by applying a policy that resolves the virtual name to a first address if the message originates from a first originator, and resolving the name to a second address if the message originates from a second originator.

4. The name router of claim 2, wherein the computer-executable instructions perform step (2) by applying a policy that resolves a given name differently depending on a domain of an originator of the message.

5. The name router of claim 2, wherein the computer-executable instructions perform step (2) by applying a policy that resolves a given name differently depending on a header portion of the message excluding the name.

6. The name router of claim 2, wherein the computer-executable instructions perform step (2) by resolving the name on the basis of a policy that resolves a given name differently depending on a content portion of the message excluding the name.

7. The name router of claim 2, wherein the computer-executable instructions further perform the step of converting a protocol of the message.

8. The name router of claim 2, wherein the computer-executable instructions further perform the step of generating, in response to an external request, a unique name incorporating a portion of the virtual name.

9. The name router of claim 2, wherein the computer-executable instructions further perform the step of generating a change notification to other name routers.

10. A method of resolving a name of a communication endpoint, wherein the name comprises a plurality of discrete name components, the method comprising the steps of:

transmitting a first communication endpoint name having a plurality of individually resolvable discrete name components including a specified host name and at least one other name component to a first name server;

transmitting a second communication endpoint name having a plurality of individually resolvable discrete name components including the same specified host name and at least one differing name component to the first name server;

receiving from the first name server a first address corresponding to resolution of the specified host name and the at least one other name component of the first communication endpoint name; and

receiving from the first name server a second, different address corresponding to resolution of the same specified host name and the at least one other differing name component of the second communication endpoint name, wherein each discrete name component is individually and independently resolvable such that the first communication endpoint name and the second communication endpoint name are resolved to different physical host servers.

11. The method of claim 10, further comprising the step of transmitting the name to the second name server with a message intended for delivery to the communication endpoint.

12. The method of claim 11, further comprising the step of requesting acceleration information representing partially resolved name results from the second name server.

13. The method of claim 10, wherein the step of receiving an Internet Protocol (IP) address is received as the first address, wherein the communication endpoint names are transmitted to a name server having the IP address.

14. The method of claim 10, wherein the communication endpoint names include the following:

a first component identifying a protocol scheme;

a second component identifying a host server; and

a third component identifying a resource.

15. The method of claim 10, further comprising the step of checking to determine whether the first communication endpoint name is stored in a local cache and, if so, transmitting a message to the communication endpoint without waiting for name resolution.

16. The method of claim 10, further comprising the step of storing in a local cache a plurality of partial name resolution results for the same name from a plurality of different name servers.

17. A computer-readable medium storing computer-executable instructions that, when executed by a computer, resolve a name of a communication endpoint, wherein the name comprises a plurality of discrete name components, the instructions performing the steps of:

transmitting both a first communication endpoint t-he name having a plurality of individually resolvable discrete name components including a specified host name and at least one other name component to a first name server and context information including one or more portions of information identifying the client transmitting the first communication endpoint name and the context information;

transmitting both a second communication endpoint name having a plurality of individually resolvable discrete name components including the same specified host name and at least one differing name component to the first name server and context information including one or more portions of information identifying the client transmitting the first communication endpoint name and the context information;

receiving from the first name server a first address corresponding to resolution of a the specified host name and the at least one other name component of the first communication endpoint name, wherein the received context information is used in the resolving process, such that the resolving is affected by at least one of the client'"'"'s identity and the client'"'"'s network location; and

receiving from the first name server a second, different address corresponding to resolution of the same specified host name and the at least one other differing name component of the second communication endpoint name, wherein each discrete name component is individually and independently resolvable such that the first communication endpoint name and the second communication endpoint name are resolved to different physical host servers and wherein the received context information is used in the resolving process, such that the resolving is affected by at least one of the client'"'"'s identity and the client'"'"'s network location.

18. The computer-readable medium of claim 17, wherein the computer-executable instructions further perform the step of transmitting the name to a second name server with a message intended for delivery to the communication endpoint.

19. The computer-readable medium of claim 17, wherein the computer-executable instructions further perform the step of receiving an Internet Protocol (IP) address as the first address, and further comprising transmitting to a name server having the IP address.

20. A method of resolving names in a computer network, comprising the steps of:

transmitting to a first virtual name router a message intended for delivery to a communication endpoint identified by a first communication endpoint name, the name including a plurality of individually resolvable discrete name components including a specified host name and at least one other name component;

the first virtual name router resolving the name into a first address, wherein each discrete name component is individually and independently resolvable such that communication endpoint names with the same specified host name and at least one differing name component are resolved to different physical host servers;

transmitting the message to a second virtual name router corresponding to the first address;

the second virtual name router resolving the first communication endpoint name into a second address; and

transmitting the message to the communication endpoint corresponding to the second address.

21. The method of claim 20, further comprising the step of transmitting the first address from the first virtual name router to an originator of the message.

22. The method of claim 20, further comprising the step of resolving the name on the basis of a policy that resolves a given name differently depending on a resolution policy stored in the first virtual name router.

23. The method of claim 20, further comprising the step of forwarding the message to a plurality of addresses depending on a resolution policy stored in the first virtual name router.

24. The method of claim 20, further comprising the step of converting a protocol format of the message in the second virtual name router.

25. The method of claim 20, further comprising the step of transmitting a notification from the second virtual name router to the first virtual name router of a name change.

26. The method of claim 20, further comprising the step of, in the first virtual name router, generating and returning upon request a unique name component incorporating at least a part of the name.

27. The method of claim 20, further comprising the step of providing a default routing for the name.

28. A method of routing a message to a communication endpoint identified by a name comprising a plurality of discrete components, the method comprising the steps of:

receiving the message identified by a first communication endpoint name comprising a plurality of discrete components at a first name router, the name including a plurality of individually resolvable discrete name components including a specified host name and at least one other name component;

in the first name router, resolving a first portion of the name into a first address, wherein each discrete name component is individually and independently resolvable such that communication endpoint names with the same specified host name and at least one differing name component are resolved to different physical host servers;

transmitting the message from the first name router to the first resolved address;

receiving the message at a second name router corresponding to the resolved address;

at the second name router, resolving a second portion of the name into a second address, wherein each discrete name component is individually and independently resolvable such that communication endpoint names with the same specified host name and at least one differing name component are resolved to different physical host servers; and

transmitting the message to a computer corresponding to the second address.

29. The method of claim 28, further comprising the step of, converting the message from a first protocol to a second protocol on the basis of information contained in a portion of the name.

30. The method of claim 28, wherein the first portion of the name is resolved on the basis of a resolution policy that allows the same name to be resolved to a different address under different circumstances.

31. The method of claim 28, wherein resolving a first portion of the name into a first address comprises resolving the name to a first address if the message originates from a first originator, and resolving the name to a second address if the message originates from a second originator.

32. The method of claim 28, wherein resolving a first portion of the name into a first address comprises resolving the name on the basis of a policy that resolves a given name differently depending on a domain of an originator of the message.

33. The method of claim 28, wherein resolving a first portion of the name into a first address comprises resolving the name on the basis of a policy that resolves a given name differently depending on a header portion of the message excluding the name.

34. The method of claim 28, wherein resolving a first portion of the name into a first address comprises resolving the name on the basis of a policy that resolves a given name differently depending on a content portion of the message excluding the name.

35. A method of routing a message to a communication endpoint in a network through a plurality of virtual name routers, wherein the communication endpoint is identified using a name of the form A/B/C, wherein each of A, B, and C comprises a discrete name component, the method comprising the steps of:

(1) transmitting the name to a domain-name server, the name including a plurality of individually resolvable discrete name components including a specified host name and at least one other name component;

(2) receiving from the domain-name server an Internet Protocol address corresponding to the A component of the name;

(3) transmitting the message and the name to a first virtual name router corresponding to the Internet Protocol address; and

(4) at the first virtual name router, resolving the B component of the name into an address of a second virtual name router and forwarding the message and the name to the address of the second virtual name router, wherein each discrete name component is individually and independently resolvable such that communication endpoint names with the same specified host name and at least one differing name component are resolved to different physical host servers;

(5) at the second virtual name router, resolving the C component of the name into an address of the communication endpoint and forwarding the message to the address of the communication endpoint.

36. The method of claim 35, further comprising the step of storing in each of the first and second virtual name routers a copy of a partially resolved portion of the name.