How to build FTP site behind cisco router ?

[$ABU FAHAD$]

Hello guys ,

I want to build FTP site behind my cisco router could you pls. advice me about the best method to do that and be note the following :
1 ) I have free public IP lets say 10.1.1.1
2) the FTP server has this private IP on the LAN 192.168.1.2
3 ) I want the outside user to access the FTP site using this URL
ftp:\\ftpcompanysite

thnx in advance to all