Understanding Your Internet Connection
If your Ethernet interface to the Internet is not working, there are ways to check what??™s happening
that will work on many Linux distributions. Use the following procedure to find out how your network
interfaces are working:
1. Open a shell (if you are using a graphical interface, open a Terminal window).
2. Type the following right after you boot your computer to verify whether Linux found
your card and installed the Ethernet interface properly:
dmesg | grep eth | less
The dmesg command lists all the messages that were output by Linux at boot time. The
grep eth command causes only those lines that contain the word eth to be printed.
Here are a couple of examples:
eth0: VIA Rhine II at 0xee001000, 00:0d:61:25:d4:17, IRQ 185.
eth0: MII PHY found at address 1, status 0x786d advertising
01e1 Link 45e1.
eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
eth0: no IPv6 routers present
The first message appeared on my desktop computer with a VIA Rhine Ethernet controller.
It shows that a card was found at software IRQ 185 with a port address of
0xee001000 and an Ethernet hardware address (MAC address) of
00:0d:61:25:d4:17. The other lines indicate that the link is up on the eth0 interface
and running at 100 Mbps in full-duplex.
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