VPN Pass-through not working on D-Link DI-524

M

ml_nelson

I have a problem with VPN through a DI-524. The basic configuration
is as follows:

- An off-site VPN Host on the Internet that I can connect to
- An XP Client for VPN which is generally behind the DI-524 and
ultimately connected to a cable modem and the Internet

For the purposes of test, I put aside the DI-524, connect my Client XP
to the cable-modem & all works well. I connect to the VPN Host & test
as follows:

1.) I execute a VPN Connection I've prepared in Network Connections.
This pops an icon in the systray showing a VPN connection to the Host.
2.) Next, I open Explorer & search for the Host by it's computer-name.
The Host shows up as an icon in explorer.
3.) When I double-click on the icon of the Host, it opens a dialog box
needing a logon & password.
4.) I enter appropriate logon & password and, Bingo… I see the shared
contents of the Host & can use it's folders & files.

Now for the problem;
I put the DI-524 in place. It has been configured with D-Link's
support help (details below). I do exactly the same exercise as above
but at step #4 when I enter appropriate logon & password, I get stuck.
The dialog box simply comes back. I can't get past this step to
actually see & use the Host resource.

Interestingly; If I use "net view" from a DOS window, I do see the
next level resources (folders & such) of the Host.

I've had D-Link support on the phone. They tweaked the settings in my
router to no avail. Their position is the router works for VPN
pass-through & the problem is elsewhere. They are undeterred in this
view by the fact that all works well with the router bypassed. I've
pointed out that others suggest that a hang at that password is
typically indicative of a failure of GRE- Protocol 47. D-Link says
they support that protocol, that's not the problem.

One of my own favorite theories is that D-Link is in error, their
router actually has a bug & does not support VPN. For what it's
worth, I did flash the latest firmware.

Router configuration is as follows (192.168.0.101 is the client's IP):

Virtual Server Stuff enabled:
PPTP 192.168.0.101 TCP 1723/1723
IPSec 192.168.0.101 UDP 500/500

Firewall settings:
Allow IPSec_ESP WAN,* LAN,192.168.0.101 ESP,
Allow PPTP WAN,* LAN,192.168.0.101 TCP,1723
Allow PPTP_GRE WAN,* LAN,192.168.0.101 GRE,

Misc. /VPN Pass-Through Settings:
PPTP Enabled
IPSec Enabled

(I have also tried DMZ & that doesn't help.)

Thoughts?
Mike
 

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