Facing problem in network config.

[gauravjain]

I am facing 1 problem. i installed ubuntu server 12.04.1 in my server pc. and connected with ethernet connection. It should take network configuration automatically but it does not do that and i dont have internet access evenif ethernet connection. So can u plz guide me what to do so that it configure network setting automatically ?
I have TP-link TL-WR740N router.

Output of ifconfig :

Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

inet6 addr: ::1/128 Scope:Host

UP LOOPBACK RUNNING MTU:16436 Metric:1

RX packets:10 errors:0 dropped:0 overruns:0 frame:0

TX packets:10 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:580 (580.0 B) TX bytes:580 (580.0 B)

[2F4U]

The address 127.0.0.1 is a kind of dummy IP address, so I am assuming that your server is not properly connected to the router. It may be a hardware problem (cable, network card, etc.), or a software problem (wrong driver for network card, dhcp misconfigured, no dhcp server reachable, router blocks, etc.).
Do you connect by cable or wireless? Is your network card recognized by Ubuntu?

[gauravjain]

This is not a problem of any hardware that i m sure. bcoz once i attached another harddisk ( in which windows is installed ) and in windows i can connect to internet without any problem. ubuntu doesnt recognize my ethernet network. i use cable to connect network.

[steeldriver]

If you are using the server version of Ubuntu, then you need to configure network connection in /etc/network/interfaces. That should have been done at install time - but the first thing is to check the contents of that file

cat /etc/network/interfaces

If that looks OK then you will want to check the hardware / driver detection e.g.

sudo lshw -C network

Post the results back here if you need help

[gauravjain]

I have solved that problem by replacing another ubuntu server. Now its working fine. BDW thanks for your support