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).
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