[pptp-server] question of performance ... ?

[Jean-Paul Chavant]

hello,

the windowing is a good idea :) thanks.
But the question now is ... does someone know where or how to
modify/implement this fonctionnality ?

Thanks.

JPaul

|
|
|     We have seen good performance on LANs. I don't have the
|     numbers but it is
|     much better than you describe.
|
|     I don't think the baud rate in the config file has anything
|     to do with the
|     actual transfer rate. In fact on the Win9x end Microsoft says
|     the baud rate
|     reported on PPTP connections is an estimation based on the
|     time it takes to
|     authenticate the tunnel.
|
|     We are having WAN performance problems though. I think it
|     might be something
|     to do with the "windowing" that PPTP does. The TODO list
|     indicates that
|     windowing needs to be improved. Bad windowing will cause significant
|     performance problems on links with high latency or packet loss.
|
|     Can anyone confirm that windowing is a problem? Is the
|     development version
|     better at this?
|
|     Thanks,
|
|     John.
|
|     > -----Original Message-----
|     > From: Jean-Paul Chavant [mailto:chavant at geosys.fr]
|     > Sent: Friday, July 07, 2000 5:24 AM
|     > To: Pptp
|     > Subject: [pptp-server] question of performance ... ?
|     >
|     >
|     > Hello,
|     >
|     > since i haved installed my PPTP VPN i have made test. And if
|     > it possible i
|     > would like to know what you think about my tests ...
|     >
|     > My server is a P3-600EB linux 2.2.14 box with PPTP 1.0.0 and
|     > PPP 2.3.11
|     > patched with opensll patch.
|     > My clients are P133/64Mo , P200MMMX/128Mo and P2-300/128Mo
|     > under Win95 and
|     > Dun1.3 (with 128 bits patch encryption).
|     >
|     > All the boxes are on a switched LAN 10/100 Mb. server has a
|     > 10/100 Mb NIC
|     > and client a 10 Mb NIC.
|     >
|     > The first test is a ping with 56 bytes packets. the tunnel
|     > connection works
|     > with a speed of 8,3 % of the clear connection ... :(
|     >
|     > The second test is a FTP with a 10Mb file. On a clear
|     > connection i have a
|     > rate of ~850 kbytes/s. On a PPTP connection i have a rate of
|     > 150kbytes/s (17
|     > %) !!
|     >
|     > I know that it's not the compression and the encryption
|     > (except on the P133)
|     > which slow down the rate (i have made test with no encryption
|     > / 40 bits
|     > encryption and 128 bits encryption and results were the same
|     > ...). It's
|     > neither the connection cable = 10 Mb.
|     >
|     > So i think it's probably :
|     >
|     > 1. the protocol PPTP him self which is very slowly ...
|     > encapsulation/overhead/etc ? If it is that why the P2-300 is
|     > so slow as the
|     > P200MMX ???
|     >
|     > 2. the speed communication between pppd and pptpd or pppd and
|     > the system
|     > (115200 in the /etc/ppp/options, but 115200 = 14.4 kbytes/s
|     > and my rate is
|     > about 150 kbytes/s ...) ? (the first best idea i think ...)
|     >
|     > 3. Win9x implementation of the PPTP protocol by Microsoft
|     > which is very bad
|     > (possible) ? (the second best idea i think ...)
|     >
|     >
|     > Someone can help me or give me good explications please ?
|     >
|     > thank you.
|     >
|     > JPaul
|     >
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