[LibreQoS] Fwd: Reverse Traceroute

Dave Taht dave.taht at gmail.com
Wed Feb 22 13:34:55 EST 2023

---------- Forwarded message ---------
From: Rolf Winter <rolf.winter at hs-augsburg.de>
Date: Wed, Feb 22, 2023 at 5:11 AM
Subject: Reverse Traceroute
To: <nanog at nanog.org>

Dear NANOG folks,

As you know, traceroute is unable to enumerate routers on the reverse
path. Given that paths through the public internet are usually
asymmetric, knowing the reverse path would be beneficial e.g. for
troubleshooting purposes (https://youtu.be/L0RUI5kHzEQ?t=2312).

We have implemented a reverse traceroute tool
(https://github.com/hsanet/reverse-traceroute), both client and server
for both IPv4 and IPv6. We are also in the process of specifying the
protocol at the IETF

We also gave a talk on reverse traceroute at DENOG14

If you would like to play with reverse traceroute, the easiest option is
to work with the client and use one of the public server instances
(https://github.com/HSAnet/reverse-traceroute/blob/main/ENDPOINTS). If
you would be willing to host a public server instance yourself, please
reach out to us. Also, if you find this work useful, please start
discussing the work at the IntArea WG at the IETF.

If you have any questions or comments, just drop us a line, file an
issue on github and/or use the IntArea mailing list.

Thanks a bunch,


A pithy note on VOQs vs SQM: https://blog.cerowrt.org/post/juniper/
Dave Täht CEO, TekLibre, LLC

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