"eth0" vs. "eth0:1"

From: A Nengineer (stunt_at_polhemus.cc)
Date: 08/02/03 

Date: Sat, 02 Aug 2003 01:25:21 GMT

Hello, all.

After several years running a Linux server here at my home office you'd
think I wouldn't be a "newbie," but the fact is that once I get it doing
what I need doing, I never really have to think about it much any more.

So when I come across a basic problem, sometimes I'm just at a loss what to
do, my "knowledge gap" is so wide.

I have an AMD Athlon single-processor box. Eventually I plan to use it to
route, but I haven't gotten there yet. Meanwhile, I have two Ethernet
"adapters," one on the mainboard and one an actual adapter card.

For some reason, one day when I was upgrading the system from Red Hat 8 to
Red Hat 9, I found I had to fiddle somehow with the network configuration.
Not recalling which card was "live," I somehow "created" a "new" device
called "eth0:1", which is LIKE the old "eth0" device I used to use,
but...er...worse.

Now, if the machine reboots, I have to MANUALLY "activate" the ethernet
card. The system is blind to the network until I do this. I cannot figure
out (a) what I did to screw this up, and (b) how to get things back right
again.

Any insights would help.

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