Darren Reed writes:
> Are you saying the encapsulation can be:
>
> IP [ L2TP [ GRE [ IP + TCP ] ] ]
>
> Is it worth trying to layer tunnel devices?
That (using TCP as the underlying transport) might be a bit bad
because TCP gives only an octet stream, but UDP makes sense here.
L2TP (and L2F) uses GRE-like headers over UDP/IP (by default), so the
stack looks something like:
IP / PPP / L2TP-GRE / UDP / IP ...
PPTP uses GRE-like headers over raw IP, so the stack is:
IP / PPP / PPTP-GRE / IP ...
--
James Carlson, KISS Network <[EMAIL PROTECTED]>
Sun Microsystems / 1 Network Drive 71.232W Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757 42.496N Fax +1 781 442 1677
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