Raspberry Pi - IP address using a Rj45 ethernet cable

I connected my Rasp Pi model B by LAN but seems did not work. It does not pick up a IP address using a Rj45 ethernet cable. Is there any way to solve it?

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rew over 11 years ago

I have the impression that when a 'pi boots it will turn off the ethernet port if it finds it unconnected.

Did you boot with the ethernet cable attached?
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robobosan over 11 years ago in reply to rew

Do you mean I have to connect the ethernet cable before boot? But not after boot?
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rew over 11 years ago in reply to robobosan

Yeah. Although the majority of Linux computers will notice the cable suddenly getting connected while they are already up-and-running, I have the impression that the 'pi does not.
This could be a hardware issue: the ethernet chip does not signal that the cable has become connected.
This could be a software issue: the driver does not handle the "cable connected" signal correctly
This could be a higher level distribution issue: someone decided that if the cable is not connected at boot, to disable the whole thing.
This could be a mis-observation on my part. Somehow I have the impression that my 'pi needs a reboot before getting ethernet connectivity again, but that might have been a coincidence. I usually do not have a screen and keyboard connected so that I can see if the 'pi still works. I powercycle it and voila it works again!
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robobosan over 11 years ago in reply to rew

Thanks! Let me try on it.
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robobosan over 11 years ago in reply to rew

Thanks! Let me try on it.
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