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2 definitions found
 for Tunnelling
From The Collaborative International Dictionary of English v.0.48 :

  Tunnel \Tun"nel\, v. t. [imp. & p. p. Tunneled
     (t[u^]n"n[e^]ld) or Tunnelled; p. pr. & vb. n. Tunneling
     or Tunnelling.]
     [1913 Webster]
     1. To form into a tunnel, or funnel, or to form like a
        tunnel; as, to tunnel fibrous plants into nests. --Derham.
        [1913 Webster]
     2. To catch in a tunnel net.
        [1913 Webster]
     3. To make an opening, or a passageway, through or under; as,
        to tunnel a mountain; to tunnel a river.
        [1913 Webster]

From The Free On-line Dictionary of Computing (30 December 2018) :

      (US: "tunneling") A networking technique used to
     carry data encoded in one protocol, A, over a channel using
     another protocol, B.  Protocol A is said to be "encapsulated" in
     protocol B and treats B as though it were a data link layer.
     Tunnelling is used to get data between administrative domains
     which use a protocol that is not supported by the internet
     connecting those domains.
     A historical example would be transmitting written text via Morse
     code - instead of having someone carry the text on paper, it is
     converted to (or encapsulated as) Morse code at one end and
     converted back to written text at the other.
     A more recent example would be tunnelling IPv6 over an IPv4
     network that does not support IPv6 natively.  Tunnelling
     techniques such as 6to4 or 6rd are used to encapsulate IPv6
     in the absence of native dual-stack support.

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