How to assign a second IP address to one Ethernet port

I did a clean install of Mac OS X Server 10.3 on my Grape 266MHz iMac (what? Why are you looking at me like that?). Before I used IPNetShareX to allow NAT via the single 10/100 Ethernet port. For some reason, this does not seem to function under 10.3 Server (don't know about 10.3 client). After some digging I came up with a soultion. If you open the file [b:5cbf4a815d]/System/Library/StartupItems/IPAliases/IPAliases[/b:5cbf4a815d], you'll find at the top: [code:1:5cbf4a815d] #!/bin/sh . /etc/rc.common ## # /System/Library/StartupItems/IPAliases/IPAliases: Start up IP aliasing. ## # This script will add IP aliases to existing interface(s) # # This script utilizes the file /etc/IPAliases.conf to determine what, if any # IP aliases need to be defined for a given network interface. The format # of the file /etc/IPAliases.conf is very strict. Entries must be in the form # of: # # interface:ipaddress[:netmask] # # See the IPAliases.conf(5) man page for further information. # [/code:1:5cbf4a815d] So, too assign another IP address to an Ethernet port create the file [b:5cbf4a815d] /etc/IPAliases.conf[/b:5cbf4a815d] and add the line [code:1:5cbf4a815d] interface:ipaddress[:netmask][/code:1:5cbf4a815d] for example, to assign 192.168.2.1 to your primary Ethernet interface you would add the line [code:1:5cbf4a815d]en0:192.168.2.1:255.255.255.0[/code:1:5cbf4a815d] Pretty nifty, huh? skinlayers[/code][/b]