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

[Wynona Stacy Lockwood]

On Thu, Mar 5, 2020 at 1:32 PM Ken D'Ambrosio <ken at jots.org> wrote:

> 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
>

I didn't see it mentioned thus far, but if this is Gigabit Ethernet, it
will sense what the proper pinout is, thus eliminating the need for a Xover
cable at all.



-- 
Wynona Stacy Lockwood
stacy at guppylog.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/ubuntu-users/attachments/20200305/922c8c47/attachment.html>