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what is tunnelling (ssh tunneling and ppp tunneling)? I searched in google but it is confusing.. can anyone provide some good material on this tunneling topic?
Tunnelling is when instead of sending a packet directly through the network you send in inside another (often encrypted) connection by means of encapsulation. In case of SSH tunnelling, TCP/IP packets are sent inside an SSH connection to another host which then decides how to treat those packets (usually forward to internal network).
The Wikipedia article about Tunnelling is helpful, but to understand it better you should have a basic idea how encapsulation and OSI model work.