You need an IP alias. Here is how to set that up.
(1) locate ip_alias.o
This will return the path to ip_alias.o
(2) /sbin/insmod full_path_to/ip_alias.o
This will load the IP alias module into your kernel
(3) cp /etc/sysconfig/network-scripts/ifcfg-INT /etc/sysconfig/network-scripts/ifcfg-INT:0
Substitute your physical interface (ex. lan0) for INT. This will create the alias interface (lan0 will also be known as lan0:0). I'll continue to use lan0 as an example in this description, but you may have a different physical interface ID.
(4) Edit the new file created from step three and modify these lines accordingly:
DEVICE=lan0:0 (instead of DEVICE=lan0)
BROADCAST=your_broadcast_for_the_second_IP_address
NETWORK=your_network_for_the_second_IP_address
NETMASK=your_netmask_for_the_second_IP_address
IPADDR=your_second_IP_address
I think this is self-explanatory, but I'm not sure how much networking background you have. If you need help determining broadcast and network email my alias and I'll explain.
(5) ifconfig lan0:0 up
That's it. Good luck! Any problems/questions feel free to email my alias.
