CentOS - Apr 2005 - multiple external addresses on one interface

I want to add two IP ranges on one NIC card (eth0 and eth0:1). Has
anyone done this before? 

The CentOS 4 gui keeps locking up when I try it there and the command
line ifconfig seems to work, but ifup always returns the error that is
never heard (no such device) of eth0:1

thanks

ryanag at zoominternet.net wrote:
> I want to add two IP ranges on one NIC card (eth0 and eth0:1). Has
> anyone done this before? 
> 
> The CentOS 4 gui keeps locking up when I try it there and the command
> line ifconfig seems to work, but ifup always returns the error that is
> never heard (no such device) of eth0:1
If you do ifconfig, then you don't need to do ifup afterwards. It comes 
up as part of the command. ifup is if you have the device or alias 
defined and it's not up and running. For CentOS/RHEL, you define the IP 
aliases in:
/etc/sysconfig/network-scripts

In fact, assuming you want the ranges to come up after reboot, it's best 
to put them there. Note that Linux (as opposed to Solaris, I think?) 
uses eth0:0 as the first IP alias of eth0 (eth0 itself being the 
primary/non-alias IP address), not eth0:1. eth0:1 would be for the 2nd 
IP alias of eth0.

But if you're doing a range, then instead of 
/etc/sysconfig/network-scripts/ifcfg-eth0:0, you'd want
/etc/sysconfig/network-scripts/ifcfg-eth0-range0
and then instead of IPADDR=, use IPADDR_START=starting.ip.address.here 
and IPADDR_END=ending.ip.address.here

johnn

On Wed, 2005-04-13 at 17:35 -0400, ryanag at zoominternet.net
wrote:
> I want to add two IP ranges on one NIC card (eth0 and eth0:1). Has
> anyone done this before? 
> 
> The CentOS 4 gui keeps locking up when I try it there and the command
> line ifconfig seems to work, but ifup always returns the error that is
> never heard (no such device) of eth0:1

Yes.  I have done this on at least two Centos 4.0 systems and it works
for me.  Both times I configured it via the command line, though.  I
find the gui frontend for networking does not fill my needs.

-geoff

ryanag at zoominternet.net wrote:
> I want to add two IP ranges on one NIC card (eth0 and eth0:1). Has
> anyone done this before? 
When you set up IP ranges, I think the if scripts use eth0:0->n already 
(one for each IP) (at least it used to, I have not checked this on EL4). 
  There could be some kind of conflict if you try to specify your own 
alias interface?

John.
> 
> The CentOS 4 gui keeps locking up when I try it there and the command
> line ifconfig seems to work, but ifup always returns the error that is
> never heard (no such device) of eth0:1
> 
> thanks
> 
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-- 
John Newbigin
Computer Systems Officer
Faculty of Information and Communication Technologies
Swinburne University of Technology
Melbourne, Australia
http://www.ict.swin.edu.au/staff/jnewbigin