Verifying GRE conversation

[Daniel vom Saal]

OK, I'm still trying to get VPN working and am having no luck. I can VPN to
the server when directly connected, and receive a 721 error when connecting
to the external IP address. This certainly would seem to be a problem
passing GRE, as discussed in multiple posts.

How can I concretely verify that the GRE packets are not making it through?
I have multiple logs in the ..\tracing directory; can any of them shed light
on the subject? My problem is I have a router from the ISP (Network
Telephone) that is (supposed to be) just bridging the connection, then I
have a LinkSys BEFVP41 acting as a NAT. Supposedly the LinkSys will pass
the conversation (using their "PPTP" option), and supposedly the Network
Telephone doesn't stop anything. However, all these "supposedly" working
options are combining to fail. So, how can I isolate each piece, starting
with making sure this truly is a problem passing the GRE conversation on
post 1723?

Thanks,

DvS

 

[Marc Reynolds [MSFT]]

You can use pptpsrv.exe and pptpclnt.exe from the Windows 2000 Support tools
(located in the Support\Tools folder on the Windows 2000 CD.

--

Thanks,
Marc Reynolds
Microsoft Technical Support

This posting is provided "AS IS" with no warranties, and confers no rights.

 

[Daniel vom Saal]

It is a Windows 2003 server, and the tools aren't on that CD. Can I just
use the Win2000 tools? Is there a document outlining their use or are they
really simple?

Thanks,

DvS

 

[Marc Reynolds [MSFT]]

you can use the 2000 or XP tools. Run pptpclnt.exe on the client and
pptpsrv.exe on the server. I believe there is a readme file with
instructions, but it is not complicated at all.


--

Thanks,
Marc Reynolds
Microsoft Technical Support

This posting is provided "AS IS" with no warranties, and confers no rights.

 

[Daniel vom Saal]

Thanks for the pointer - I got the tools working, and they confirm that the
GRE is failing. Now to isolate which piece of equipment is filtering it
out...