On Fri, Jun 09, 2023 at 05:52:48PM +0100, mick.crane wrote: > On 2023-06-08 19:08, Mike Castle wrote: > > > I couldn't afford a large enough harddrive for the second system, nor > > ethernet cards (and a local shop was going to charge me $50 to make a > > crossover cable if I went that route!). > > swapping around the red and red-white with the green and green-white wires > seemed to work. > mick
Wait... Ethernet crossover cables? You must have vintage hardware.
Most twisted pair Ethernet ports these days support Auto MDI-X [1]
so they do the crossover thingy themselves.
To find out, you do:
tomas@trotzki:~$ sudo ethtool eth0
[sudo] password for tomas:
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Speed: Unknown!
Duplex: Unknown! (255)
Auto-negotiation: on
Port: Twisted Pair
PHYAD: 2
Transceiver: internal
MDI-X: Unknown (auto)
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000007 (7)
drv probe link
Link detected: no
...and look at the line "MDI-X: ...". In my case "Unknown" means that
there's nobody at the other end, "(auto)" means that my interface is
willing to bargain. NB: this is on pretty old hardware, a Thinkpad
X230, roughly from early 2010s.
Cheers
[1] https://en.wikipedia.org/wiki/Auto_MDI-X
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