LAN internet connection having effective mechanism to classify LAN traffic and resolve address resolution protocol requests

• US 6,189,042 B1
• Filed: 04/08/1998
• Issued: 02/13/2001
• Est. Priority Date: 04/09/1997
• Status: Expired due to Fees

• Current Assignee: Alcatel SA (Nokia Corporation)
• Original Assignee: Alcatel SA (Nokia Corporation)
• Inventors: Keller-Tuberg, Stefan Paul
• Primary Examiner(s): Maung, Zarni
• Assistant Examiner(s): DINH, KHANH Q
• Application Number:
  US09/057,173
• Time in Patent Office: 1,042 Days
• Field of Search: 370/405, 370/312, 370/349, 370/219, 370/401, 709/249, 709/228, 709/245, 709/222, 709/238
• US Class Current: 709/238
• CPC Class Codes: H04L 12/2856 Access arrangements, e.g. Internet access asynchronous transfer mode networks H04L12/5601; broadband local area networks H04L12/2801; optical access or distribution networks H04Q11/0067; access to open networks H04L12/5691; digital subscriber line end-user equipment and bit-level processing of data on a PSTN-based network H04M11/00; home network gateways H04L12/2834; wireless access networks H04W
• CPC Class Codes: H04L 12/2872 Termination of subscriber connections
• CPC Class Codes: H04L 12/5601 Transfer mode dependent, e.g. ATM
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04L 2012/5618 Bridges, gateways [GW] or interworking units [IWU]
• CPC Class Codes: H04L 2012/5658 using the AAL5
• CPC Class Codes: H04L 2012/5667 IP over ATM
• CPC Class Codes: H04L 2012/5672 Multiplexing, e.g. coding, scrambling
• 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: H04Q 11/0478 Provisions for broadband connections

Abstract

A method to reduce the amount of Address Resolution Protocol (ARP), traffic in a LAN environment connected to the Internet via multiport gateway, 63. The gateway, 63, stores a list of terminals connected to its local LAN Paths 61, 62, and determines if the destination of the ARP request is one of the terminals, 611 . . . 622, connected to the local LAN paths. If the destination terminal is not connected to the local LAN paths, the gateway does not rebroadcast the ARP request to the local LAN paths.

Claims

1. In a LAN environment including:

a plurality of communication paths each having a plurality of stations connected thereto wherein said communication paths include one or more local communication paths and one or more further communication paths; and

at least one gateway having one or more local ports, each connected to a corresponding one of the local communication paths and one or more second ports each of which coupled to a further communication paths and/or a network,

a method of forwarding an Address Resolution Protocol message (ARP request) including a location of a destination station broadcast by one of the stations connected to one of the communication paths, wherein the gateway includes stored data associated with the communication paths, so that the gateway forwards a communication establishing an ARP request only to the communication path to which the addressed station is connected, said method comprising the steps of;

including in the stored data a range of addresses associated with the local and second ports; and

determining from the range of addresses the local port and second port to which the ARP request will be forwarded so as to eliminate the need to forward the ARP request to the communication paths not connected to the addressed station.

2. The method of claim 1, wherein the reqesting station is connected to one of the local communication paths.

3. The method of claim 1, wherein the requesting station is connected to one of the further communication paths.

4. The method of claim 1, wherein the range of addresses comprises LAN MAC addresses of the stations connected to each of the local communication paths.

5. The method of claim 2, wherein the range of addresses comprises LAN MAC addresses of the stations connected to the local communication path to which the requesting station is connected.

6. The method of claim 2, wherein the range of addresses comprises LAN MAC addresses of the stations connected to the communication paths other than the communication path to which the requesting station is connected.

7. The method of claim 1, wherein the range of addresses comprises IP addresses of the stations connected to the local communication paths.

8. The method of claim 1, wherein the range of addresses comprises LAN MAC addresses of the stations connected to the further communication paths.

9. The method of claim 1, wherein the range of addresses comprises IP addresses of stations connected to the further communication paths.

10. The method of claim 1, wherein the LAN environment further includes one or more further gateways connecting to one or more sub-networks of further communication paths and wherein said further gateways include a more authoritative gateway which is responsible for determining a route or path to an addressed station connected to one of the sub-networks, so that when the gateway cannot determine from the range of addresses the address of the addressed station, or the address of the further gateway connecting to the addressed station'"'"'s sub-network such that the first gateway has no predefined direct communications route leading towards the addressed station, the gateway responds to the requesting station with an address corresponding to a communication oath towards the more authoritative gateway so as to eliminate the need to forward the ARP request to the communication paths not connected to the more authoritative gateway.

11. The method of claim 1, wherein each further communication path is coupled to individual ports of the gateway via corresponding further gateways, and wherein the stored data further includes information associating each of the stations connected to the further communication paths with the corresponding further gateway so as to allow the ARP request to be forwarded to the further communication path to which the addressed station is connected without being forwarded to the communication paths not connected to the addressed station.

12. The method of claim 1, wherein in order to enable communication with a mobile station associated with one of the local communication paths whether the mobile station is connected to one of the other local communication paths or whether it is connected to one of the further communication paths or elsewhere, the method further includes the setup of storing the identity of the port from which the most recent communication from the mobile station is received so that this identity can be used to establish a communication link to the mobile station so as to eliminate the need to rebroadcast the ARP requests from the mobile station over the ports of the gateway.

13. The method of claim 12, further including the steps of measuring the time since the most recent communication was received from the mobile station, and deactivating the stored information as to the location of the mobile station after a predetermined period has elapsed.

14. An arrangement for locating a mobile station in a LAN environment including a data gateway having a plurality of local ports, and a plurality of LANs each connected to a corresponding local port, wherein one of the LANs is connected to a network via a learning bridge device, and wherein the mobile station is associated with one of the LANs, said arrangement comprising:

stored data associating each one of the local ports with a range of LAN MAC addresses associated with the other local ports; and

a mask arrangement or look up table to allow the data gateway to forward a LAN frame received on any one of the local ports to one of the other local ports marked by the LAN MAC address included in the LAN frame on the basis of the range of LAN MAC addresses such that the data gateway does not forward the LAN frame to the ports that is not masked port, wherein the learning bridge device is programmed to proxy for the mobile station only when the data gateway has detected that the mobile station is connected to the network side of the data gateway so as to eliminate the need to forward an ARP request destined to the mobile station to the local ports.