Talk:Tunneling protocol
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[edit] Why is PPP over modem not tunneling?
Why is PPP over a POTS or ISDN modem not considered as tunneling? PPP over modem is an LLC protocol encapsulated in another. Okay, a modem behaves as if it were a circuit switched physical link (an asynchronous serial link), but modern modems include LLC sublayer, since they divide the data into blocks (some kind of packets) rather than codewords (there are no start and stop bits), and performs packet mode flow control and automatic repeat request.
I don't undertand the definition, that tunneling is encapsulation of A in B as if B were a datalink protocol. In many tunelling protocols B is a datalink protocol. Example: PPPoE, PPPoA, etc. Mange01 18:09, 15 November 2006 (UTC)
