Multiple IP Addres one NIC Card..

So I found this article on Apple
http://developer.apple.com/server/optimizexserve.html
Unfortunately it did not work on 10.4 and if you look at the date on that, it would be 2003 so I was wondering how you do this? I have 15 IP's coming to my XServe G5 and I want to shy away from doing virtual hosting and use the IP's I have first, then do virtual if I need to. I followed that article and rebooted and in Server Admin it does not show more then my IP already. I did flip it down to other and type it in manually then apache would not start once I saved the changes. I have searched apple and google and so far that is the only article I can come up with. Found some for linux though...

It appears as though the /System/Library/StartupItems/IPAliases script which parses the /etc/IPAliases.conf file during startup is broken.
If you specify the IPAliases.conf file as per the directions in the article you reference it won't work.
Your options are to either edit the script to work correctly or change how you define your IP addresses in /etc/IPAliases.conf (I recommend the latter option).
The script does work fine if you use CIDR notation in /etc/IPAliases.conf.
That is, instead of using the form described by the technote:
interface:IPaddress:netmask
use:
interface:IPaddress/bits
The technote states that the subnet mask should always be 255.255.255.255 (which corresponds to /32), but I'm not sure of the reason for this. It seems to work fine with /24 (255.255.255.0) and other values.
In any case, edit /etc/IPAliases.conf to use /notation rather than :netmask and you should be fine.

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