Re: VPN Error 721 on one machine, others work

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Leythos wrote:
On Tue, 27 Mar 2007 22:30:01 -0700, mwh wrote:

Router = Linksys WRT54G.

PPTP is enabled.

Since posting originally, I've been able to connect TWO machines through the router simultaneously. Third machine, the problematic one, does not.

I was at the home of one client, they had people in from their home
office. They have a wireless linksys router also - she had used her laptop
to connect via VPN into the company server for 6+ months, without a
problem.

Once onsite I was able to see what you are seeing - the first two could
connect and remain connected most times, but the third could not connect
or would get errors and then one of the others might drop out.


There's a big difference between getting two VPN connections to the same
endpoint from different source IP addresses, and doing it from the same
source IP address.

No hardware should be expected to do the latter, as multiple PPTP GRE
tunnels between the same endpoints must be controlled by one TCP/1723
channel, according to the PPTP specification.

This is not possible when the multiple tunnels actually originate on
multiple machines, which appear to share the same source IP address
using NAT. In the case you cite, considerable luck would have been
needed for a second link to be made without breaking the first. I had
a go at this long ago, and the first link never survived the attempt
at the second. It was, of course, after I had spent a couple of hours
trying it that I researched it properly. RTFM? Who, me?

While it is possible to construct a site-to-site VPN between a Windows
workstation and an SBS, that does require some static TCP/IP routes to
be set up at both ends and afterwards removed.
.

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