On Mon, 2009-03-02 at 13:28 -0500, Graham Campbell wrote:
> 
> I'm puzzled. Don't all VPN's run over IP?

That's probably too a too broad and sweeping statement to possibly be
true, but not really important to this discussion because GRE is a
protocol that runs on IP, yes, like UDP and TCP (and ICMP, and ...) do.

> And probably with TCP???

Not usually.  If one is going to use a non encapsulating protocol (which
is what GRE is) one usually uses UDP as the protocols involved in TCP
(window sizing, retry algorithms, etc.) usually foul up the
effectiveness of a VPN protocol.

b.

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