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 From:  "Holger Bauer" <Holger dot Bauer at citec dash ag dot de>
 To:  "KH Lau" <KH dot Lau at wongswec dot com>, <m0n0wall at lists dot m0n0 dot ch>
 Subject:  RE: [m0n0wall] PPTP only one can be access?
 Date:  Tue, 9 May 2006 10:28:17 +0200
This should be a faq (don't know if it already is in there but it pops up quite frequently at the

You can't go with multiple PPTP-clients through a m0n0 to the same PPTP-Server. The PPTP-Protocol
doesn't NAT very good and it would need some kind of Proxy to inspect the packets and devide the
different sessions again as they are established between the same public IPs at both ends.

However, you can go through a m0n0 with different PPTP-Clients to different PPTP-Servers at the same

This is a limitation and there is no fix for this unless a PPTP-Proxy is integrated into m0n0.


> -----Original Message-----
> From: KH Lau [mailto:KH dot Lau at wongswec dot com]
> Sent: Tuesday, May 09, 2006 9:10 AM
> To: m0n0wall at lists dot m0n0 dot ch
> Subject: [m0n0wall] PPTP only one can be access?
> Hello,
> I have two NIC's for both LAN and WAN. In the LAN segment 
> connecting to other
> location via PPTP as the result only one PPTP connection can 
> be established
> others will get error code 721 using WinXP. Does m0n0wall not 
> support multi
> PPTP connections? any one know how to fix it?
> Thanks in advance.
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