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Tunnel Tracing

This document outlines the requirements and proposed solutions for a Generic Tunnel Tracing Protocol (GTTP) designed to enhance the tracing of tunnels within a network. It covers both nested and heterogeneous tunnels, ensuring compatibility across different data and control planes. The proposal operates in multiple phases: the first phase identifies the top-level IP path, while subsequent phases may uncover supporting tunnels. The GTTP solution includes secure, stateless operation with probes that provide detailed responses, offering more information than traditional ICMP messages.

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Tunnel Tracing

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  1. Tunnel Tracing R. Bonica, R. Dube, K. Kompella, D. Meyer, E. Rosen

  2. Two Drafts • Requirements • draft-ietf-ccamp-tracereq-00 • WG draft • Proposed Solution • draft-bonica-tunproto-03 • individual contribution

  3. Requirements Draft • Common • any kind of tunnel • nested tunnels • heterogeneous tunnels • Traces through data plane, control plane or both • Secure • Stateless

  4. Proposed Solution • Generic Tunnel Tracing Protocol (GTTP) • Similar to traceroute • Probes and Responses • Response carries more information than ICMP Time Expired Message • Operates in phases • First phase discovers top level IP path • Top level details include identifier for supporting tunnels • Second phase discovers supporting tunnels • Additional phases if required

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