How to add a range of IPs on a BSD box.

FreeBSD is a popular free Unix like open source operating system that is based on the Berkeley Software Distribution (BSD) version of the Unix operating system. FreeBSD runs only on the Intel PC platform (i386 and higher) having atleast Pentium processor and also on amd64, Alpha/AXP, IA-64, PC-98 and UltraSPARC processors. You can consider FreeBSD as an alternative to Linux which will run Linux applications. Its said that its fast, stable, and is appropriate for Internet server or as a file server. FreeBSD supports all major X Window desktops, such as KDE and GNOME.

If you want to add Dedicated IPs on server having FreeBSD you need to follow following instructions.
First login to your FreeBSD server as a ‘non-root’ user. You should have an account in the ‘wheel’ group. Once you logged in your server just run the following commands to switch users to ‘root’

su -
Password:
server#

you will get command prompt as ‘#’ which indicates that you are operating server as ‘root’ user. Now run following commands as root :
ee /etc/rc.conf

now for example, if we want to add 4 IPs for your server [ 192.168.1.3 - 192.168.1.6 ] you need to implement following :
Code:
ifconfig_fxp0=”inet 192.168.1.2 netmask 255.255.255.248?
ifconfig_fxp0_alias0=”inet 192.168.1.3 netmask 255.255.255.255?
ifconfig_fxp0_alias1=”inet 192.168.1.4 netmask 255.255.255.255?
ifconfig_fxp0_alias2=”inet 192.168.1.5 netmask 255.255.255.255?
ifconfig_fxp0_alias3=”inet 192.168.1.6 netmask 255.255.255.255?

Note that changes to the _aliasNN and also the netmask changes to 255.255.255.255 from 255.255.255.248. The IP’s will not work unless you use a 255.255.255.255 netmask for the alias IP’s.

Once you added the entries to your file you need to press ‘ESC’ and have to save this file. You need to reboot the server so that all new IP’s would get bounded with your server and you can use them.
You have other option too, you can also use ifconfig command for adding IP’s on your server, in this case you don’t have to reboot your server. You can also add extra Dedicated IPs if you have WHM/cPanel control panel with your server. just login to your WHM account and add new Dedicated IP using WHM >> Add a new IP.