[pptp-server] Performance

[Jean-Francois Gagnon]

Be careful,

Download speed on a cable modem can be very fast... in excess of 200KB per
second, but Upload can be limited to 10KB per second.

Also, a 56Kb modem has a similar behavior where the upload speed is a
fraction of the download speed.

Hope this helps

JFG

> -----Original Message-----
> From: pptp-server-admin at lists.schulte.org
> [mailto:pptp-server-admin at lists.schulte.org]On Behalf Of Andrew McRory
> Sent: Friday, August 18, 2000 1:18 PM
> To: Derek Simkowiak
> Cc: Michael C. Mitchell; pptp-server at lists.schulte.org
> Subject: Re: [pptp-server] Performance
>
>
> On Fri, 18 Aug 2000, Derek Simkowiak wrote:
>
> > -> I have a user complaining that performance seems lacking when
> > -> he VPN's in via his cablemodem.  We have a 784K SDSL link and
> > -> no one was on it but him.  Does pptpd speed get limited to 115K?
> >
> > 	That seems to be the case.  Check the archives; people can't seem
> > to get faster that 115K.  Setting different MTUs doesn't fix it, either.
> > The speeds for the Linux PPTP server and WindowsNT server are roughly
> > equal, although WindowsNT is just a little faster.
> >
> > 	What I have not seen is someone using the Linux client into the
> > Linux PPTP server.  As far as I know, the ~115K limitation
> might be in the
> > MS-Windows PPTP client.
> >
> > 	Can anyone here verify?
> >
>
> I have used PoPToP across DSL, Cable Modems and point to point links.
> Never once saw a performance problem (except IPX routing) and get over
> 40kbps on a 1024kbps cable modem. The speed setting in the PoPToP config
> file is 115200 so it doesn't seem to matter what it's set to.
>
> Windows always reports a connection rate of 100,000,000 when I'm on a
> 100MB LAN routed through a Linux box with ip_mask_pptp loaded... Here's my
> config files:
>
> ==== /etc/pptp.conf ====
> speed 115200
> option /etc/pptpd.options
> localip 10.10.10.1
> remoteip 10.10.10.240-254
> listen 256.176.322.777 (intentionaly malformed address :)
>
> ==== /etc/pptpd.options ====
> lock
> auth
> login
> proxyarp
> name vpnconn
> require-pap
> ms-wins 10.10.10.1
> ms-dns 10.10.10.1
>
> ==== /etc/rc.d/init.d/pptpd - Caldera OpenLinux 2.x ====
> #!/bin/sh
> #
> # pptpd         This shell script takes care of starting and stopping
> #               pptpd (PPTP VPN daemon).
> #
> #
> NAME=pptpd
> DAEMON=/usr/sbin/$NAME
>
> # Source function library.
> . /etc/rc.d/init.d/functions
>
>
> # See how we were called.
> case "$1" in
>  start)
>   [ ! -e $SVIlock ] || exit 1
>   [ -x $DAEMON ] || exit 0
>
>   # Start daemons.
>   echo -n "Starting PPTPD VPN service: "
>   ssd -S -x $DAEMON -n $NAME -- $OPTIONS
>   echo "."
>
>   touch $SVIlock
>   ;;
>
>  stop)
>   [ -e $SVIlock ] || exit 0
>
>   # Stop daemons.
>   echo -n "Shutting down PPTPD VPN service: "
>   ssd -K -x $DAEMON -n $NAME
>   echo "."
>
>   rm -f $SVIlock
>   ;;
>
>  reload)
>   [ -e $SVIlock ] || exit 0
>   echo -n "Reloading PPTPD VPN service: "
>   ssd -K --signal 1  -x $DAEMON -n $NAME
>   echo "."
>   ;;
>
>  *)
>
>   echo "Usage: pptpd {start|stop|reload}"
>   exit 1
>   ;;
> esac
>
> exit 0
>
> ==== /etc/sysconfig/daemons - Caldera OpenLinux 2.x ====
> IDENT=pptpd
> DESCRIPTIVE="PPTPD VPN Server"
> ONBOOT="no"
>
>
> See? Nothing special me thinks...
>
>
> Andrew McRory - President/CTO      amacc at iron-bridge.net *****************
> The PC Doctor, Inc.                www.pcdr.com            850-575-2713 **
> Iron Bridge Communications by PCDR www.iron-bridge.net     850-575-0779 **
> Contributed Caldera OpenLinux RPMS ftp.iron-bridge.net/pub/Caldera      **
> **************************************************************************
>
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