Unfortunately the VPN server is Microsoft and thus I am forced to use PPTP
which is GRE.

On Mon, Mar 2, 2009 at 7:34 PM, Brian J. Murrell <[email protected]>wrote:

> 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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