[pptp-server] NAT problem / several clients behind one

[Mikael Lönnroth]

I believe this question has been answered a couple of times (notably I think Charlie Brady explained exactly which RFCs are involved), here is my simple version: 

Poptopop distinguishes clients only from their source IP address. Thus, when several clients connect from the same natted address, things stop working. With Windows it works although Microsoft's implementation does not conform with the RFCs.  

If you use Linux as your NAT box, you might have some luck (I've seen connection tracking patches/helpers for 2.2.* and 2.4.* kernels). 

MY REAL QUESTION: Is there any reason why we cannot add this same non-RFC functionality to Poptop?

Regards,
Mikael Lönnroth
www.advancevpn.com

----- Original Message ----- 
  From: Murali K. Vemuri 
  To: pptplist 
  Sent: Monday, January 28, 2002 8:35 PM
  Subject: [pptp-server] NAT problem


  hi, 
  i have this problem and the setup is as follows: 

  Multiple PPTP clients behind a NAT box do not seem to work when trying 
  to connect to VPN box. 

   Here is the setup: 

   multitple PPTP sessions using Win2K ----- NAT box ----- internet 
   ------ RF650VPN (ASL) box ------ private server 

   The VPN box will not work when multiple PPTP clients come in from the 
   same NAT box, I tested three different NAT boxes (Linksys, Draytek and 
   Multi-Tech) and they all have the same problem.  If I replace the VPN 
   box with Windows 2000 PPTP server, then I do NOT see the problem. 

   The question now is, does the POPTOP support multiple PPTP clients coming 
   in from a NAT box that has only one public IP.????? 

-- 
regards & thanks for your time,

Murali Krishna Vemuri
    
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