Before revision: Common tunneling protocols IP in IP (IP protocol 4): IP in IPv4/IPv6 SIT/IPv6 (IP protocol 41): IPv6 in IPv4/IPv6 GRE (IP protocol 47): Generic Routing Encapsulation OpenVPN (UDP port 1194) SSTP (TCP port 443): Secure Socket Tunneling Protocol IPSec (IP protocols 50 and 51): Internet Protocol Security L2TP (UDP port 1701): Layer 2 Tunneling Protocol L2TPv3 (IP protocol 115): Layer 2 Tunneling Protocol version 3 VXLAN (UDP port 4789): Virtual Extensible Local Area Network .
After revision: Common tunneling protocols IP in IP (IP protocol 4): IP in IPv4/IPv6 SIT/IPv6 (IP protocol 41): IPv6 in IPv4/IPv6 GRE (IP protocol 47): Generic Routing Encapsulation OpenVPN (UDP port 1194) SSTP (TCP port 443): Secure Socket Tunneling Protocol IPSec (IP protocols 50 and 51): Internet Protocol Security L2TP (UDP port 1701): Layer 2 Tunneling Protocol L2TPv3 (IP protocol 115): Layer 2 Tunneling Protocol version 3 VXLAN (UDP port 4789): Virtual Extensible Local Area Network