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PPTP VPN Problem - Linux Client connecting to Windows 2003 server

Posted on 2007-03-31
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Last Modified: 2008-06-24
I am running OpenSuse 10.2 attempting to connect to a PPTP VPN on a Windows 2003 Server.   I am using KVpnc for the client.  I can manage to authenticate and connect when I check off "Refuse EAP" in the profile with the rest defaults.  I can not establish a connection without checking refuse EAP.  When I do establish a connection (with refuse EAP)  it does NOT change my IP nor can I browse the remote network or do anything that the VPN is suppose to allow me to do.  Also the connection will drop frequently and reconnect.  When I connect to the same VPN using windows it works just fine using all defaults on the windows VPN client.  I do have to add the LAN IP of the windows 2003 server as a WINS server with the windows client in order to browse computers by name instead of IP.  I don't really need this function, that is just a bonus, I can get by with using IP's to navigate to the computers, I just need to be on that subnet.  Please help.  
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Question by:wallspc
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by:ShineOn
ID: 18832081
Herbert Graeber has some updated NetworkManager-pptp packages at his opensuse download location: http://software.opensuse.org/download/home:/hgraeber/openSUSE_10.2/

Supposedly works with PAP but CHAP still being worked on...  Don't know about EAP...

Worth a shot.

Are you using KDE or Gnome?  Supposedly PPTP config in Gnome is ahead of PPTP config in KDE.

Moving PPTP config to YaST is on the wishlist.
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by:Gabriel Orozco
ID: 18834433
I have used http://pptpclient.sourceforge.net/ in the past and it works great with chap.

It is a more manual process but you can get a pretty stable pptp vpn with it.
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by:wallspc
ID: 18840312
Yes it appears that both the KDE and Gnome client front ends use the same program as Redimido is referencing.  When I went to to manually configure I noticed all the files and settings were already in place, generated by KVpnc.  As far as I can tell I have everything set correctly, and I am able to authenticate and connect, however it is just not working properly.  I am trying to find out more information about the settings on the 2003 server end.  
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by:Gabriel Orozco
ID: 18841636
Well then, you must know compression over pptp requires a propietary algorithm and thus is not included in any linux as standard.

use mschap v2 and ssl encryption also.
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by:dlanciani
ID: 19633629
Windows PPTP servers are frequently configured to use their main address (i.e., the address to
which you make the PPTP connection) as their address on the virtual PPP connection.  Unix (and
Cisco for that matter) PPTP clients are frequently configured to install a host route to their peer
on bringing up a PPP (virtual or otherwise) link.  Thus as soon as the link comes up, traffic destined
for the PPTP server is routed through the PPTP connection.  This obviously doesn't work and the
link soon times out for missed keepalive packets.  When the link goes down the host route is
removed and the PPTP server is once again reachable so the link can come back up.  Repeat
ad nauseam.   You can usually work around this by suppressing the host route and/or using
a different address to contact the server.
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by:Hanno Schröder
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No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I will leave the following recommendation for this question in the Cleanup Zone:
PAQ and refund points.

Any objections should be posted here in the next 4 days. After that time, the question will be closed.
JustUNIX, Experts Exchange Cleanup Volunteer
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