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

[Derek Simkowiak]

-> Try
-> 
-> mru 1400
-> mtu 1400
-> 
-> in your options file.

	Why would he use 1400 instead of 1500?  I believe 1500 bytes is
what most ethernet cards use for internal buffering (and 1500 is what's 
usually recommended for dial-up modem users)...


--Derek


-> 
-> 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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