>> I have been looking for some information on sub interfacing a network 
>> card.  I know the card can handle it because there is already eth0:0, 
>> eth0:1, and eth0:2, I just haven't done this before.

> Easy way: ifconfig eth0:5 123.34.56.78 netmask 255.255.255.0 up
> (I chose :5 just because - it can be any number.  I also choce a bogus 
> IP address.)

123.34.56.78 is a valid IP address, per se...

> Unfortunately, if you want to make it survive a reboot, or a network 
> init script invocation, you need to add it to the distribution-specific 
> network configurations.  Debian is different that RH/Mandrake.
> 
> Just in case you are using RH:
> cd /etc/sysconfig/networl-scripts
> cp ifcfg-eth0 ifcfg-eth0:5
> vi ifcfg-eth0:5

Nice thing about the RH config file naming, you don't have the name the file 
after the device.  RH network scripts use the DEVICE= line to determine what 
device to change, so you could call the file ifcfg-domain and then invoke it 
with "ifup domain" and RH will know to use that file and device eth0:5.

This is useful as you can then name the files to help you remember what they are 
for (such as if you have virtual adapters for FTP, HTTP, IRC, etc...).

> Change it as shown:
> DEVICE=eth0:5
> BOOTPROTO=static
> BROADCAST=123.34.56.255
> IPADDR=123.34.56.78
> NETMASK=255.255.255.0
> NETWORK=123.34.56.0
> ONBOOT=yes
> TYPE=Ethernet
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