James Carlson wrote:
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.
Sorry, the final "IP + TCP" is meant to refer to the original packet data
before it started to get tunneled.
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 ...
Why have you inserted PPP in there?
Darren
_______________________________________________
networking-discuss mailing list
[email protected]
