3. Protocol description
The L2TP protocol enables PPP sessions to be transported through a tunnel over Layer 2 (ATM/Frame Relay) or Layer 3 (IP) links.
For a PPP session to be transported to an LNS, one of the two ends (e.g. the LAC) must request the creation of a tunnel. The other end (the LNS) then sends confirmation of the tunnel creation. The LAC responds by also sending a tunnel creation confirmation. The control connection is thus initiated on the tunnel. An L2TP session is then established by sending similar control messages (request, 1 re confirmation, 2 nde confirmation) on the control channel. Data can then be sent via the L2TP tunnel. The protocol regularly sends control messages, which must be acknowledged to ensure correct communication through...
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Protocol description
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