Yes, as you already found out, the IP is only accessible from within the LAN. I think you can access it anyways if you ask for their outside IP and if they forward the ftp port to the their internal ftp server. I am not a network guy though, probably Hilmar Zonnenveld can help you better
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges
