Your corporate environment is connected to the Internet, so how does it work? Chances are you use one of these 3 WAN Protocols: HDLC, PPP, or Frame-relay.
Let’s explore how they works.

HDLC
HDLC stands for High-Level Data Link Control protocol. It is a bit-oriented, synchronous data link layer protocol created by the International Organization for Standardization (ISO). It would be running over the WAN, between the two locations. Each router would be de-encapsulating HDLC and turning dropping it off on the LAN.

In WiJungle, you can check the status through find_ip_address command.

PPP
Point-to-Point Protocol is a data link layer communication protocol between two routers directly without any host or any other networking in between. It can provide connection authentication, transmission encryption, and data compression. It is used by mostly every dial up connection to the Internet.

In WiJungle, you can change the encapsulation to PPP either through GUI or running the command
ip_address mdf encapsulation ppp

Frame Relay
Frame relay is a protocol that defines how frames are routed through a fast-packet network based on the address field in the frame. Frame relay takes advantage of the reliability of data communications networks to minimize the error checking done by the network node. This is done with permanent virtual circuits (PVC). A PVC is a connection from one site, to another site, through the carrier’s network. This is really just a configuration entry that a carrier makes on their frame relay switches.