I ran into that same problem with MS PPTP and a remote office. And yes it
was all in the 1 IP Address and multiple vpn clients. My work around was
putting in a LAN-to-LAN IPSec tunnel, your work around could be more static
IP Addresses, depending on your costs. You could also try a Linux server as
their gateway, I never ran into problems with multiple vpn users using that
as their gateway

Michael
Pathfire
[EMAIL PROTECTED]

-----Original Message-----
From: Simon Spurrell, T-GR [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, October 01, 2002 4:26 AM
To: [EMAIL PROTECTED]
Subject: [FW-1] Microsoft PPTP across address translation router


I have the following situation:

A Remote Office with 1 to 4 users want to connect with laptop via PPTP
Remote Access VPN to a Microsoft PPTP VPN server.

Remote office have an Office Grade ADSL router with address translation. One
dynamically assigned IP Address for the ADSL router.

In the main office we have a checkpoint firewall with a DMZ. The Microsoft
VPN server has one network card in the DMZ and one network card on the LAN.
We use the IP Address of the DMZ network card for the VPN tunnel
configuration on the clients.

The problem is only one (sometimes two) clients from the remote office are
able to connect to the Microsoft VPN server. If more than this try to
connect, one clients VPN tunnel is dropped.

I think it is a problem with the ADSL address translation router.

Has anyone had this problem before? When I called the ADSL company they
said, "this is the case because the ADSL router only has one internet
routable IP Address".

The ADSL ISP are able to give me one fixed IP on request. They might be able
to replace the router. They are not able to give me a subnet of real IP's.

Could anyone advise.

Thanks.
Simon

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