[CentOS] multiple external addresses on one interface

[ryanag at zoominternet.net]

You are the man. The below worked perfectly. :-)

On Wed, 2005-04-13 at 14:51 -0700, Johnn Tan wrote:
> 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
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