LAN setup for mutiply player on Red Alert 3

I am trying to setup LAN play between two Win7 computers each with it own copy or Red Alert 3, but when I set the IP address (which each has a separate IP address) they cannot see one another. I have read some post talk about Red Alert 2 using IPX/SPX. Is that the same with Red Alert 3? Should I set a port on each PC? Need some help -- thank you