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Even if network is missconfigured, leds should be on, right?

So here my network map:

modem_------cab1-------(eth0)_linux_(eth1)------cab2----_winxp

the led does NOT work ONLY when I connect eth1 with winxp, they seem to be the same cables.

It used to WORK before, when it was like this:

modem_------cab1-------(eth0)_winxp_(eth1)------cab2----_linux
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Do you see both interfaces in /proc/net/dev? Are they both UP state? –  Keith Nov 15 '12 at 17:02
    
What kind are the interfaces? gigabit ethernet? "fast" ethernet (100MB)? –  Keith Nov 15 '12 at 17:03
    
I think beegeees was close, cable order matters... –  juk Nov 15 '12 at 17:16
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closed as not a real question by KronoS, TFM, ChrisF, CharlieRB, 8088 Nov 15 '12 at 21:04

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2 Answers

No. Most cards have several LEDs. Some which indicate an established link, some which indicate data transmission.

If your cards have no link, e,g, due to a broken cable, or because you use a plain Ethernet (not a crosscable) between olders network interfaces without MDI/MDX then you will not get a link.

Your card could also be one with only a transmission LED. In which case establishing merely a link but not transmitting anything would not cause it to light up.

In your case I would start with:

  1. Do things work as expected, just no LED. (In which case see above two reasons).
  2. If it does not work, do a have a proper cable (cross cable)
  3. Does my cable work with other hardware? (not only right type, but is it also unbroken).

...

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1. NO, xp says no connection, LED works, see edit; 2. used to work, see edit; 3. see 2; –  juk Nov 15 '12 at 16:53
    
OK, wokrs now... I just exchanged cab1 with cab2 and it worked... –  juk Nov 15 '12 at 17:14
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if you got a router/switch/hub between then then yes you should get Link_LED_ON if your trying to connect them directly you probably need a differnt cable -> crossover-cable

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