Crimping cable fun (was: Is there a way to discover what subnet a device is using?)

[Ken D'Ambrosio]

On 2020-03-05 12:57, Drew Einhorn wrote:

> It's been even longer since I crimped a crossover cable. Because back in the day I bought some adapters with male and female rj45 you can put on the end of any ethernet cable and use it as a crossover. Everybody should try a garden variety cable first and if it doesn't work they know what to google.

One fun one that I had to crimp only a few years ago was a loopback
cable:
1 <---> 2 
3 <---> 5 
But *to itself*.  Basically, the RJ-45 and two wires going between those
four pinouts.  Why?  Because there was something wonky about the
machine, and if it didn't see a link, various stuff wouldn't happen,
*even though we didn't care about the port or want it active*.  So we
had the port give link to itself. Worked like a charm.   

(Hmmm.  Old memories are coming back -- it might have had to do with a
licensing daemon.  Though I'm not sure.) 

-Ken
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/ubuntu-users/attachments/20200305/41c6076b/attachment.html>