Port forwarding can be defined as implementation of the Network Address Translation to send requests to communicate from one IP address and port number to other when you are located outside the network. It basically transmits the traffic from the outside network to the local network.
Tunnelling can be defined as a protocol that lets secure passage of data from one network to another by allowing the communication of private network to be sent across a public network, by making use of encapsulation. Tunnelling has proven to be highly beneficial as it lets an organization create their Virtual Private Network with the help of the public network and provide huge cost benefits for users on both the end.
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