[pptp-server] can I have a pptp vpn between two nat's?

[Jerry Vonau]

Lillian:

You can get a pptp vpn client from:

http://merced.needsabeating.com/pptp/howto.html  (latest version)
also has pppd pre-patched for 128 bit mppe in rpm or tar
(works great, no fussing with patching pppd)

http://cag.lcs.mit.edu/~cananian/Projects/PPTP/ (original version)

and do what Steve was suggesting.
I'm doing that now with 2 remote lans and the main lan all linked up.

Jerry Vonau



Lillian Kulhanek wrote:

> Here's the setup:
>
> Lan1 (Win98SE clients) is masqueraded behind a linux
> gateway.  The linux pptp server is behind the gateway,
> with port forwarding occurring from the gateway to
> pptp server.  (vpn masquerading)
>
> Lan2 (Wind98SE & NT4Server) is nat'ed behind a cisco
> 1600.  The NT server has a public address as well (2
> nics).  The NT server was set up as a pptp server as
> well, for the sake of testing.
>
> The goal is for lan2 clients to log on to and access
> lan1.
>
> Here's what we can do:
>
> 1)  Home users can connect to Lan1 with pptp.
> Proves that the pptp server is working.
>
> 2)  From a pc with a private address in lan1, I can
> connect to the pptp server in lan2, using its public
> address.
> Proves that there is no port/protocol blockage, at
> least in that direction.
>
> A pc in lan2 CANNOT make a pptp connection to the pc
> in lan1.  I was wondering if this was because of
> nat'ing on both sides?  But isn't portforwarding
> supposed to take care of this?
>
> I don't remember reading anything that says I can't do
> this.  Can anyone enlighten me on why or why not?
> Would this also explain why I can't run NetMeeting
> between the two lan's?  Although, I can't see a reason
> why this should not work.  Could this be a routing
> issue on the cisco box (to which the isp limits
> access)?
>
> Answers, pointers to url's, greatly appreciated.  A
> timely response would also be appreciated, since I'm
> at lan2 flying back to lan1 in a few days.
>
> Thanks,
> Lillian
>
> PS  Finally, am I missing something obvious, even an
> obvious alternate solution?
>
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