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Raspberry Pi - IP address using a Rj45 ethernet cable

robobosan

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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  • I just checked this on my RasPi, which is running Debian "Squeeze".

     

    On my RasPi, Ethernet does not need to be plugged in at boot time.  I plugged in the cable after booting and Debian detected the cable and configured fine.   Use the GNU "ifconfig" command to see what your Ethernet configuration is.

     

    When debugging network problems, start at layer 1 and work your way up.

     

    1.  Plug in the cable.  RasPi's network LEDs should come up.  In my case I get FDX (full duplex), LNK (blinks when there's activity), and 100 Mb/s.  If you don't get LNK, there's something wrong with your cable or the router or other device at the other end.

     

    2.  The default configuration is for RasPi to get an IP address automatically using DHCP (Dynamic Host Control Protocol).  Your network needs to have a DHCP server somewhere.  I use a router to connect all my Ethernet devices and it's the DHCP server.  If you're connecting using an Ethernet switch or just a cable to a PC, then a PC or a router elsewhere on the network needs to be the DHCP server.

     

    Hope this helps!

Reply

  • I just checked this on my RasPi, which is running Debian "Squeeze".

     

    On my RasPi, Ethernet does not need to be plugged in at boot time.  I plugged in the cable after booting and Debian detected the cable and configured fine.   Use the GNU "ifconfig" command to see what your Ethernet configuration is.

     

    When debugging network problems, start at layer 1 and work your way up.

     

    1.  Plug in the cable.  RasPi's network LEDs should come up.  In my case I get FDX (full duplex), LNK (blinks when there's activity), and 100 Mb/s.  If you don't get LNK, there's something wrong with your cable or the router or other device at the other end.

     

    2.  The default configuration is for RasPi to get an IP address automatically using DHCP (Dynamic Host Control Protocol).  Your network needs to have a DHCP server somewhere.  I use a router to connect all my Ethernet devices and it's the DHCP server.  If you're connecting using an Ethernet switch or just a cable to a PC, then a PC or a router elsewhere on the network needs to be the DHCP server.

     

    Hope this helps!

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