Microsoft RRAS server and VPN client supports PPTP, L2TP/IPSec, SSTP and IKEv2 based VPN connection. PPTP control path is over TCP and data path over GRE. L2TP tunnel traffic is carried over IPSec transport mode and IPSec protocol internally has a control path through IKE and data path over ESP. SSTP control and data path is over TCP. IKEv2 control path is over IKE and data path over ESP.
Port: there are thousands of ports on a computer through which data is sent and received over any network. Different applications/programs use different ports to send/receive data over a network/internet. Remote port: destination port number for your connection on PIA servers. Changing the protocol(TCP/UDP) and remote port number can help tunnel through a firewall if the default settings won't connect. Local port: port number on your machine for received connection from PIA. Port forwarding: PIA will open another port for peer to peer traffic to connect directly to you through their server(eg torrent application).
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Remote port: destination port number for your connection on PIA servers. Changing the protocol(TCP/UDP) and remote port number can help tunnel through a firewall if the default settings won't connect.
Local port: port number on your machine for received connection from PIA.
Port forwarding: PIA will open another port for peer to peer traffic to connect directly to you through their server(eg torrent application).