Basically, tunnelling is a process that allows data sharing or communication between two different networks privately. Tunneling is normally performed by encapsulating the private network data and protocol information inside the public network broadcast units so that the private network protocol information is visible to the public network as data.
SSH Tunnel: Tunneling is the concept of encapsulating the network protocol into another protocol. Here we put it into SSH, so all network communication is encrypted. Because tunnelling involves repackaging the traffic data into a different form, perhaps with encryption as standard, a third use is to hide the nature of the traffic that is run through the tunnels.
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