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