Need a tool
 

Is there any tool that can change/disguise your ip adress to something u want?

Depends on what you are doing, but in general the answer is no.

well, can u act like if u were in a specific location? Because I need to download something from a specific place. But im not there,and the ftp server requires that the connection is made from a particular domain.

disguising your ip address is relatively easy using a anonymous proxy...simple program for that is <a href="http://anon.inf.tu-dresden.de/index_en.html">JAP</a> (JAP will route you through one of several non-logging servers in Dresden...) but to change it to a specific ip address you would need to find a box in that domain that runs a proxy (like squid) and run go like that....but good luck finding that...

edit: Aren't you that guy who just posted that sketchy topic asking for the same thing? ....this sounds rather fishy to me...

The best way to do that is to tunnel from your machine to a remote machine that does have access to the server. Then access the FTP site from the remote machine. However for most of the solutions I can think of to work, you need an actual machine within the allowed IPs, which probably doesn't help you much.

With all the energy and time you are spending trying to cheat the system I bet you could've done by hand whatever work you wanted the Mathematica package to do.