"Howard C. Berkowitz" wrote:
>
> In the most general sense, a tunnel is a means of taking a protocol
> data unit payload of OSI layer N of protocol family P1: (N,P1)-PDU,
> and transmitting it with a delivery header at layer M of protocol
> family P2. What is actually transmitted is, minimally, a (N,P1)-PDU
> encapsulated in a (M,P2)-PDU. There may be a "shim" between the end
> of the delivery header and the beginning of the payload header;
> there's no good OSIRM term for the shim.
In a slightly less mathematical explanation:
Think about the encapsulation steps while traveling down the stack.
Are one or more layers repeated? If so, then tunneling is involved.
Yeah, that's simplistic.
- Marty
Message Posted at:
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