[pptp-server] speed issues and ppp.c compile problems

[Mike Edwards]

OK, I'm playing with the packet size settings a bit, and I think I'm
seeing an improvement.  As to posting my results, I will gladly do so
but am not sure how to quantify the speed of the connection.  I suppose
I could log pings (remote to node through VPN and back), but would that
be enough?

BTW, why would one NOT want to use encryption?  Doesn't that help ensure
the P in VPN?

Thanks for everybody's input!

Mike

"Jose M. Sanchez" wrote:
> 
> This might be a fragmentation problem.
> 
> PPTP needs to encapsulate the entire PPP TCP/IP packet WITHIN another IP
> packet.
> 
> The problem is that the "inner" packet does not "fit".
> 
> In your PPTP options file (make sure that you are getting the right one, it
> does no good for you to modify your PPP options file to connect to your
> ISP!) reduce the size of the MTU & MRU values...
> 
> I.E.
> 
> mru 1400
> mtu 1400
> 
> Smaller still if you are using encryption...
> 
> That said, note that the PPTP speed will indeed be SLOWER than your normal
> connection rate.
> 
> I've recently read a few discussions which indicated that the maximum speed
> is approximately 1/2 your bandwidth speed if encryption is enabled.
> 
> Post your results.
> 
> Cheers.
> 
> -JMS
> 
> |-----Original Message-----
> |From: pptp-server-admin at lists.schulte.org
> |[mailto:pptp-server-admin at lists.schulte.org]On Behalf Of Mike Edwards
> |Sent: Tuesday, August 01, 2000 3:37 PM
> |To: pptp-server at lists.schulte.org
> |Subject: [pptp-server] speed issues and ppp.c compile problems
> |
> |
> |Hi!
> |
> |After successfully installing pptp and friends on a 486-66 box, we found
> |that the VPN established was so slow as to be unusable--even with a T1
> |connection on the server side and a cable modem (600+Kbps downstream,
> |128+Kbps upstream) on the client side.  My first question then is, What
> |are the minimum hardware requirements for the PoPToP Server?  I should
> |add that our main goal is to run a client application over the VPN.
> |(The software is a print-management system for the commercial printing
> |industry running on an NT box with MS SQL Server.  The NT pptp server
> |wouldn't work at all and, besides, it's Not Scottish!)
> |
> |I am already trying to re-install on a P133 box, but have run into
> |compilation problems.  I am using a stock Red Hat 2.2.14 kernel and
> |tarballs of OpenSSL 0.9.5 and ppp-2.3.11.  I applied the appropriate
> |ppp/openssl/mppe patch before compiling, but when I ran "make modules"
> |it bombed out on the ppp.c compile, giving errors to the effect of
> |"static declaration for X follows non-static" where X is
> |ppp_register_compressor and ppp_unregister_compressor.  Did I miss a
> |patch somewhere or must I be running a 2.2.16 kernel?
> |
> |Thanks in advance!
> |Mike
> |
> |--
> |Mike Edwards, MIS
> |Edwards Graphic Arts, Inc.
> |2700 Bell Avenue
> |Des Moines, IA  50321
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-- 
Mike Edwards, MIS
Edwards Graphic Arts, Inc.
2700 Bell Avenue
Des Moines, IA  50321