Let me clarify a little bit.
The machine has one network adapter which has two physical ports in it labled 
port1 and port2.

[root@bob ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:18:8B:74:A3:B5
          inet addr:10.0.1.9  Bcast:10.0.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:16776 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9061 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:13611191 (12.9 Mb)  TX bytes:1029762 (1005.6 Kb)
          Interrupt:16 Memory:f4000000-f4011100

eth1      Link encap:Ethernet  HWaddr 00:18:8B:74:A3:B3
          inet addr:10.0.1.75  Bcast:10.0.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:79 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:8601 (8.3 Kb)  TX bytes:64 (64.0 b)
          Interrupt:16 Memory:f8000000-f8011100

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:4139 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4139 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:215881 (210.8 Kb)  TX bytes:215881 (210.8 Kb)

Only eth0 is plugged in to the switch. eth1 is unplugged.
From another workstation, 10.0.1.70, I can ping both 10.0.1.9 and 10.0.1.75.
If I remove the cable from eth0 and plug it into eth1 I cannot ping either 
address.

These are not :1,2,3 virtual interfaces. And I am only pinging from the 
seperate machine, 10.0.1.70. Not on the localhost...

nathan
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