[pptp-server] strange problem...

[Mikael Lönnroth]

strange problem...Hi there, 

This is also just guessing, but I have notice that something like this can happen when you use several PPTP clients behind a NAT router. 

Briefly, when you connect your first client everything works nicely. When the second client connects, the actual connection can be established ok but after this no data seems to go through (at least for the second client) . 

To the VPN server, the first client has sent a number of GRE packets, and now the second client starts sending packets using the same source IP address (because it is natted), but with new packet order numbers. The VPN server can't distinguish between the connections... and things fail... 

Well, like I said, this is just guessing. 

Regards,
Mikael Lönnroth
www.advancevpn.com

  ----- Original Message ----- 
  From: Timothy Findlay 
  To: 'pptp-server at lists.schulte.org' 
  Sent: Thursday, January 03, 2002 2:46 PM
  Subject: [pptp-server] strange problem...


  Hi, 

  I know this proberly isn't the right place for this question, but not quite sure where to go with it. 

  I've installed PPTPD on a hacked up RH 7.1 box and the clients connect to it fine (works like a charm!). However with 2-3 laptops(running Win98 SE), after installing the Microsoft VPN Adapter (which works cool) regular internet connections bugger up. When we dial Joe Bloggs service provider (which used to work fine) it connects, authenticates, looks fine, but when we fire up a web browser it only transfers a tiny bit of information and then stops. 

  It's almost like it disables the connection, no pings or traceroutes work after been connected to the provider for more than say 10-15 seconds.

  I'm wondering if adding the VPN support (in the Add/Remove Windows bits) is overwriting some file somewhere in windows for the TCP/IP stack or something.... but I just dont know, most systems work fine after adding the VPN stuff, but only these 2-3 Acer laptops seem to bugger up.

  Any thoughts ?? Anything I should be looking at ?? 

  Thanks, 
  Tim. 

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