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   feld (feld@bikeshed.party)'s status on Friday, 25-Aug-2023 12:28:37 JST feld
   Some OSes and BIOSes have the ability to estimate the Ethernet cable length
   
   Does anyone know of a program that can do this? Something I can run on Linux/BSD?
   • Embed this notice
     feld (feld@bikeshed.party)'s status on Friday, 25-Aug-2023 13:09:11 JST feld

     in reply to
     I have a spare Juniper EX3300! I can use that to figure out that's up with this mystery cable that goes to nowhere
     
     https://www.juniper.net/documentation/us/en/software/junos/interfaces-ethernet-switches/topics/ref/command/show-diagnostics-tdr.html
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     feld (feld@bikeshed.party)'s status on Friday, 25-Aug-2023 13:27:30 JST feld

     in reply to
     Here's one for optical 😳
     
     https://www.trend-networks.com/us/product/otdr-ii-tester/
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     RevK :verified_r: (revk@toot.me.uk)'s status on Saturday, 26-Aug-2023 04:33:00 JST RevK :verified_r:

     in reply to

     @feld I think that is done by various Ethernet hardware, so they would just be exposing that feature. I don’t think you can do it in software in anyway as it is done using TDR on the pairs.

     feld likes this.