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If your friend wants 2 internet lines/connections then there are considerations. 2x ADSL connections will require 2 phone lines to the premises otherwise the speed would still be limited to that of one line, and you can only connect one ADSL modem per line due to how it is connected …
The client sending data would need to be in a network environment where it can open port(s) on the public IP address to establish a direct connection without a central server. It could do this using UPnP if it's available in the network as a lot of BitTorrent clients do …
You would need to forward ports on your router in order to access the server from inside the NAT over the Internet. Forwarded ports work fine for most applications however there are some that will not place nice.
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