86.128.93.129 is to be given to your mate if he is connecting to your computer over the internet. If you hooked to the same router it is the other one. You need to tell the routher to forward the connection to your computer with the other IP atleast in some occations. This is done differently on different routers, you also have to make sure that your firewall is letting the connection through and that the right ports are opened up for connection.
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