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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mconners over 11 years ago in reply to rew

I just tried this on mine, and it recognized the pi and I was able to log in via the network. I powered it on, waited about 30 secs. Plugged in the rj45 and it popped up on my router's list of devices.

I'm running an old version of rasbian with kernel 3.6.11

cat /etc/issue says Debian GNU/Linux 7.0

Mike
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mconners over 11 years ago in reply to rew

I just tried this on mine, and it recognized the pi and I was able to log in via the network. I powered it on, waited about 30 secs. Plugged in the rj45 and it popped up on my router's list of devices.

I'm running an old version of rasbian with kernel 3.6.11

cat /etc/issue says Debian GNU/Linux 7.0

Mike
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