> I could set up but the Machine A only access to one URL or Site at
> same time.
> How can I access to any URL at internet from Machine A?
>

nginx is a reverse-proxy, what you are looking for is a forward-proxy
and you could use apache or squid for this

for more information on diffferences reverse vs forward-proxy
read http://stackoverflow.com/questions/224664/difference-between-proxy-server-and-reverse-proxy-server

cheers,


mex