Layer Two Tunneling Protocol (L2TP) uses TCP port 1701 and is an extension of the Point-to-Point Tunneling Protocol. L2TP is often used with IPSec to establish a Virtual Private Network (VPN). Point-to-Point Tunneling Protocol (PPTP) uses TCP port 1723 and IP port 47 Generic Routing Encapsulation (GRE).

https://www.softether.org/4-docs/2-howto/9.L2TPIPsec_Setup_Guide_for_SoftEther_VPN_Server/4.Windows_L2TP_Client_Setup

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