I have two networked desktops, one is a homebuilt 500mhz AMD processor and
the other is an HP Pvilion that has been expanded. They share an Actiontec
Gateway supplied by Qwest for the DSL service and are connected by ethernet
cable. When I query with ifconfig, both Lumumba and Dhoruba report that
eth0 is "UP", here is the output:

Lumumba

eth0      Link encap:Ethernet  HWaddr 00:80:AD:78:F6:87
          inet addr:192.168.0.2  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:31367 errors:14093 dropped:0 overruns:0 frame:0
          TX packets:27224 errors:7 dropped:0 overruns:0 carrier:7
          collisions:0 txqueuelen:1000
          RX bytes:26746763 (25.5 Mb)  TX bytes:3764779 (3.5 Mb)
          Interrupt:3 Base address:0xb000

Dhoruba

eth0      Link encap:Ethernet  HWaddr 00:80:AD:78:F5:06
          UP BROADCAST NOTRAILERS MULTICAST  MTU:1500  Metric:1
          RX packets:6859 errors:14240 dropped:0 overruns:0 frame:0
          TX packets:508 errors:12 dropped:0 overruns:0 carrier:12
          collisions:0 txqueuelen:1000
          RX bytes:1517654 (1.4 Mb)  TX bytes:59179 (57.7 Kb)
          Interrupt:3 Base address:0xd000

I assume the fact that there is no line starting with "inet" has something
to do with the problem, but I am not knowledgeable enough to do more than
select the correct card and DHCP button in the config utility. Let me know
if you need more information...