Method for facilitating application server functionality and access node comprising same

• US 8,072,978 B2
• Filed: 10/27/2005
• Issued: 12/06/2011
• Est. Priority Date: 03/09/2005
• Status: Expired due to Fees

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Absillis, Luc
• Primary Examiner(s): Sefcheck, Gregory
• Assistant Examiner(s): Thompson, Jr., Otis L
• Application Number:
  US11/259,863
• Publication Number:
  US 20060203827A1
• Time in Patent Office: 2,231 Days
• Field of Search: 709/203
• US Class Current: 370/392
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/10 of different types
• CPC Class Codes: H04L 67/10015 Access to distributed or replicated servers, e.g. using brokers

Abstract

An access node comprises an application server, a logical access port coupled to the application server and a redirection filter module coupled to the logical access port. The redirection filter module includes a data redirection filter and an Address Resolution Protocol (ARP) redirection filter. The data redirection filter facilitates a data packet received on the access port being directed to the application server when a destination Media Access Control (MAC) address of the data packet corresponds to a MAC address of the application server or when a destination Internet Protocol (IP) address of the data packet corresponds to an IP address of the application server. The ARP redirection filter facilitates an ARP reply message being issued when a target IP address of an ARP request message received on the access port corresponds to the IP address of the application server.

Claims

1. A method for facilitating application server functionality in an access node;

comprising;

accessing an Address Resolution Protocol (ARP) request message designating a target Internet Protocol (IP) address in response to the ARP request message being received on a logical access port of the access node wherein the access node is located at the edge of a network and comprises a point of end user access to the network;

issuing an ARP reply message associating the target IP address with a Media Access (MAC) address of an application server integrated within the access node in response to successful correlation of the target IP address with an IP address assigned to the application server; and

redirecting to the application server a data packet received on the logical access port in response to a destination address of the data packet corresponding to one of an IP address and MAC address of the application server wherein the application server is separately addressable within the access node and there is an internal data path from the logical access port to the application server located within the access node and wherein the IP address and the MAC address of the application server are unique addresses that are only visible on the internal data path; and

providing redirection filtering functionality for the access port, wherein said providing redirection filtering functionality includes specifying conditional information for a data redirection filter and specifying conditional information for an ARP redirection filter and when the application server is addressable from the network, the application server is assigned an IP address in a different subnet range than the user facing addresses.

2. The method of claim 1 wherein said issuing includes determining the MAC address in response to accessing the ARP request message and wherein the application server supports a variety of different types of functionality including security and state maintenance, data access and persistence, and content caching.

3. The method of claim 1, wherein:

said specifying conditional information for the data redirection filter includes specifying that a data packet received on the access port is directed to the application server when a Destination MAC address of the data packet corresponds to the MAC address of the application server or when a Destination IP address of the data packet corresponds to the IP address of the application server; and

said specifying conditional information of the ARP redirection filter includes specifying that an ARP reply message is issued when a target IP address of an ARP request message received on the access port corresponds to the IP address of the application server.

4. The method of claim 3, further comprising:

assigning the MAC address of the application server, wherein the MAC address of the application server is coupled to the IP address assigned to the application server.

5. The method of claim 1, further comprising:

assigning the IP address of the application server to the application server;

assigning the MAC address of the application server, wherein the MAC address of the application server is coupled to the IP address assigned to the application server; and

providing redirection filtering functionality on the logical access port prior to the application server being assigned the IP address and MAC address.

6. The method of claim 5, further comprising:

sending a message from the application server to an appropriate logical access port in response to a redirection filter module determining the appropriate access port.

7. The method of claim 6 wherein said determining includes assessing a destination MAC address designated in the message sent from the application server.

8. An access node, comprising:

at least one data processing device;

a logical access port coupled to said at least one data processing device;

an application server coupled to said at least one data processing device;

memory coupled to said at least one data processing device; and

instructions accessible from said memory and processable by said at least one data processing device, wherein said instructions are configured for enabling said at least one data processing device to facilitate;

accessing an Address Resolution Protocol (ARP) request message designating a target Internet Protocol (IP) address in response to the ARP request message being received on the logical access port of the access node wherein the access node is located at the edge of a network and comprises a point of end user access to the network;

issuing an ARP reply message associating the target IP address with a Media Access (MAC) address of the application server in response to successful correlation of the target IP address with an IP address assigned to the application server; and

redirecting to the application server a data packet received on the logical access port in response to a destination address of the data packet corresponding to one of an IP address and MAC address of the application server wherein the application server is separately addressable within the access node and there is an internal data path from the logical access port to the application server located within the access node and wherein the IP address and the MAC address of the application server are unique addresses that are only visible on the internal data path; and

providing redirection filtering functionality for the logical access port, wherein said providing redirection filtering functionality includes specifying conditional information for a data redirection filter and specifying conditional information for an ARP redirection filter and when the application server is addressable from the network, the application server is assigned an IP address in a different subnet range than the user facing addresses.

9. The access node of claim 8 wherein said issuing includes determining the MAC address in response to accessing the ARP request message.

10. The access node of claim 8, wherein:

said specifying conditional information for the data redirection filter includes specifying that a data packet received on the access port is directed to the application server when a Destination MAC address of the data packet corresponds to the MAC address of the application server or when a Destination IP address of the data packet corresponds to the IP address of the application server; and

said specifying conditional information of the ARP redirection filter includes specifying that an ARP reply message is issued when a target IP address of an ARP request message received on the access port corresponds to the IP address of the application server.

11. The access node of claim 10 wherein said instructions are further configured for enabling said at least one data processing device to facilitate:

assigning the MAC address of the application server, wherein the MAC address of the application server is coupled to the IP address assigned to the application server.

12. The access node of claim 8 wherein said instructions are further configured for enabling said at least one data processing device to facilitate:

assigning the IP address of the application server to the application server; and

assigning the MAC address of the application server, wherein the MAC address of the application server is coupled to the IP address assigned to the application server.

13. The access node of claim 12 wherein said instructions are further configured for enabling said at least one data processing device to facilitate:

sending a message from the application server to an appropriate logical access port in response to a redirection filter module determining the appropriate access port.

14. The access node of claim 13 wherein said determining includes assessing a destination MAC address designated in the message sent from the application server.

15. An access node, comprising:

an application server;

a logical access port coupled to the application server;

and a redirection filter module coupled to the logical access port, wherein the redirection filter module includes a data redirection filter and an Address Resolution Protocol (ARP) redirection filter wherein the application server is separately addressable within the access node and wherein the access node is located at the edge of a network and comprises a point of end user access to the network and there is an internal data path from the logical access port to the application server located within the access node and wherein the redirection filter module provides redirection filtering functionality for the access port, wherein said providing redirection filtering functionality includes specifying conditional information for the data redirection filter and specifying conditional information for the ARP redirection filter and when the application server is addressable from the network, the application server is assigned an IP address in a different subnet range than the user facing addresses.

16. The access node of claim 15 wherein:

the data redirection filter facilitates a data packet received on the access port being directed to the application server when a destination Media Access Control (MAC) address of the data packet corresponds to a MAC address of the application server or when a destination Internet Protocol (IP) address of the data packet corresponds to an IP address of the application server; and

the ARP redirection filter facilitates an ARP reply message being issued when a target IP address of an ARP request message received on the access port corresponds to the IP address of the application server and wherein the IP address and the MAC address of the application server are unique addresses that are only visible on the internal data path.

17. The access node of claim 16 wherein:

the MAC address of the application server is coupled to the IP address assigned to the application server.