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

[Jose M. Sanchez]

|-----Original Message-----
|From: Mike Edwards [mailto:medwards at ega.com]
|Sent: Thursday, August 03, 2000 4:03 PM
|To: opjose at ex-pressnet.com
|Cc: pptp-server at lists.schulte.org
|Subject: Re: [pptp-server] speed issues and ppp.c compile problems
|
|
|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?
|

Heh, what I meant was to post what happens to the list so that everyone can
see if this worked or not.

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

Yes, but if you are not concerned about what is being transmitted, you get a
performance increase.

Frankly I believe that at times people are a little too concerned about the
"p". After all, who cares about XYZ's companies financials.

I use VPN for remote access sessions. I'm not exactly worried about someone
looking over my shoulder. There is not a lot of valuable info that they
would get.... but your results may vary...

Good luck.

-JMS

|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