[PLUG] Ubuntu: Testing Wired Network Connectivity - Simple Method

[Mike C.]

Reading through the threads I realized this has become somewhat of a
convoluted topic. I wanted to figure out a sure-fire, quick and simple
approach not only for Rich but for myself and others that could be followed
and would help folks determine where the problem might be.

So here's the method, I've come up with.

1. Run the command "ifconfig" from a terminal shell.
   It the command results show an "eth" interface with a "HWaddr" then the
OS sees the NIC. Which means the NIC drvier module is loaded. Go to step 5
*
*
*ifconfig eth0*
*eth0      Link encap:Ethernet  HWaddr 00:1c:25:18:3c:78  *
*          UP BROADCAST MULTICAST  MTU:1500  Metric:1*
*          RX packets:0 errors:0 dropped:0 overruns:0 frame:0*
*          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0*
*          collisions:0 txqueuelen:1000 *
*          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)*
*          Interrupt:20 Memory:fe000000-fe020000 *

2. If you don't see any "eth" interfaces listed then run the command "dmesg
| grep Ethernet" to get information on the physical card

*lspci | grep Ethernet*
*00:19.0 Ethernet controller: Intel Corporation 82566MM Gigabit Network
Connection (rev 03)*
*
*
3.* *Then run the command "dmesg | grep Network" to get driver information
*
*
*dmesg | grep Network*
*[    1.382194] e1000e: Intel(R) PRO/1000 Network Driver - 1.5.1-k*
*
*
4. Then run the command "lsmod | grep <network driver>". In this example
the command would be "lsmod | grep e1000e"