Kevin Brown wrote:
>>> 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...

Valid, yes, but most likely bogus in this application :)


>> 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


I've seen weird things happen when the name of the file is not the same 
as the DEVICE= name, so I prefer to keep them the same.  A couple of us 
were quite amused when we had an interface called eth0:1.bak because 
someone saved a backup copy of ifcfg-eth0:1 (called  ifcfg-eth0:1.bak) 
in the /etc/sysconfig dir and it had the same IP address as eth0:1.

This was on RHAS 2.1 - maybe things have improved since then.

-- 
George Toft, CISSP, MSIS
AGD,LLC
www.agdllc.com
623-203-1760
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