Hybrid Flow Path Tracing Across NAT and Unicast-Multicast Translation
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Solution Overview
Problem
End-to-end path tracing of network address translated (NATed) or hybrid flows between unicast and multicast in IP fabric is challenging due to information loss and complexity arising from multiple network devices and different sender/receiver endpoints, making debugging and troubleshooting difficult.
Innovation Solution
A method involving the generation of merged flow data records that combine unicast and multicast flow data records, using hybrid flow records to provide end-to-end visibility and visibility of paths traversed by traffic flows, correlating flow records from first and last hop routers and intermediate nodes to handle IP address and port translation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If network address translation is performed between unicast and multicast traffic flows, then cloud networking capability is improved, but path tracing visibility deteriorates
Solution Approach 1:
The patent introduces an intermediary translation mapping data structure that stores the relationship between unicast and multicast traffic flow identifiers. This intermediary structure acts as a bridge between the translated traffic flows, enabling path tracing visibility to be maintained despite the NAT translation process. The mapping data structure correlates pre-translation and post-translation flow records, allowing network management systems to trace the complete path of hybrid traffic flows through the cloud network.
2Adaptability or versatility
If traffic flow translation between unicast and multicast is implemented, then cloud platform compatibility is improved, but debugging and troubleshooting difficulty increases
Solution Approach 1:
The patent implements a feedback mechanism where network management systems query the translation mapping data structure to retrieve path information for hybrid traffic flows. This feedback loop provides real-time visibility into the location and status of translated traffic flows, enabling effective debugging and troubleshooting. The system can trace the complete path from source to destination, identifying where translations occur and maintaining the ability to diagnose network issues despite the complexity introduced by NAT.
3Loss of information
If end-to-end path tracing is attempted for translated hybrid flows, then network visibility is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by creating and maintaining the translation mapping data structure before path tracing operations are performed. The mapping relationships between unicast and multicast flow identifiers are established in advance during the NAT translation process. This pre-established mapping structure simplifies subsequent path tracing operations, as the network management system can directly query the existing mapping data rather than attempting to reconstruct translation relationships after the fact, thereby reducing overall system complexity.
Data Source
AI summary
Methods are provided for visualizing end-to-end path traversed by a hybrid media traffic flow. Specifically, the methods involve obtaining at least one hybrid flow record that includes information about a source of a traffic flow prior to performing a network address translation for the traffic flow. The traffic flow traverses from the source, along a path in a network, to a destination. The method further involves generating a merged flow data record in which at least two flow data records are merged based on the at least one hybrid flow record. The at least two flow data records include a unicast flow data record and a multicast flow data record based on the traffic flow traversing along the path in the network. The method further includes providing an end-to-end visibility of the path traversed by the traffic flow based on the merged flow data record.