[pptp-server] question of performance ... ?
Patrick Reid
P.J.Reid at earthling.net
Fri Jul 7 12:24:38 CDT 2000
Try
mru 1400
mtu 1400
in your options file.
Patrick Reid
-----Original Message-----
From: pptp-server-admin at lists.schulte.org
[mailto:pptp-server-admin at lists.schulte.org]On Behalf Of Jean-Paul
Chavant
Sent: July 7, 2000 11:25 AM
To: Pptp
Subject: RE: [pptp-server] question of performance ... ?
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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