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Determining a path through a managed network

  • US 6,785,735 B2
  • Filed: 10/16/2002
  • Issued: 08/31/2004
  • Est. Priority Date: 11/12/1999
  • Status: Expired due to Term
First Claim
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1. A method for determining a route for a data packet from a source node to a destination node, comprising the steps of:

  • determining a first portion in the route by identifying a first gateway in the route, wherein the first portion is from the source node to the first gateway, wherein the first gateway is the next intermediate gateway that a packet send from the source node to the destination node would visit, and wherein the source node does not support source-route IP path tracing; and

    determining a second portion of the route by source-route IP path tracing, and wherein the second portion is from the first gateway to the destination node, wherein identifying the first gateway comprises the steps of;

    determining a second gateway used by the source node to reach a network management node;

    determining a third gateway based on the second gateway and the destination node;

    using the second gateway as the first gateway only if the third gateway and the source node are on different subnets; and

    using the third gateway as the first gateway only if the third gateway and the source node are on the same subnets.

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