[pptp-server] PPTP VPN Connection Performance Under Linux vs Windows

John Pang whoami1234_1234 at yahoo.com
Wed Jul 24 21:58:40 CDT 2002


Hi,

Thanks for your reply. I did some testings and
realised that it was the NAT on my Cisco router which
caused the slowness. After I disabled the NAT, the
problem went away for Linux clients.

Pretty wierd but at least it's back to normal for now.

Thanks!

--- "R. de Vroede" <r.devroede at linvision.com> wrote:
> I'm guessing linux is obeying the negotiated
> (default) speedlimit in
> /etc/pptpd.conf of 115200 bits per second. Wouldn't
> be the first time M$
> Windows does everything it's own way. Just set the
> speed to 1000000.
> This should crank up the speed for the linux-boxes.
> 
> Regards,
> Richard
> 
> 
> On Tue, 2002-07-23 at 16:14, John Pang wrote:
> > Hello everyone,
> > 
> > I have successfully installed PPTPd 1.1.2 on my
> RedHat
> > Linux 7.2 server with kernel 2.4.19-pre10 and PPP
> > 2.4.1 .
> > 
> > The kernel has also been patched to support MPPE
> while
> > PPP has been patched to support MSCHAPv2+MPPE as
> well.
> > 
> > All appears to be working properly and I am able
> to
> > configure my Windows and Linux clients to connect
> to
> > the VPN just fine with MSCHAPv2 & MPPE 128bit
> enabled.
> > 
> > Jul 23 00:04:35 server pppd[30452]: pppd 2.4.1
> started
> > by root, uid 0
> > Jul 23 00:04:35 server pppd[30452]: Using
> interface
> > ppp0
> > Jul 23 00:04:35 server pppd[30452]: Connect: ppp0
> <-->
> > /dev/pts/0
> > Jul 23 00:04:35 server pppd[30452]: MSCHAP-v2 peer
> > authentication succeeded for test
> > Jul 23 00:04:36 server pppd[30452]: local  IP
> address
> > 192.168.1.1
> > Jul 23 00:04:36 server pppd[30452]: remote IP
> address
> > 192.168.1.2
> > Jul 23 00:04:36 server pppd[30452]: MPPE 128 bit,
> > stateless compression enabled
> > Jul 23 00:04:36 server pppd[30452]: stateless MPPE
> > enforced
> > 
> > For Windows machines, I am using the MS VPN
> Adapter
> > which comes with the OS.
> > 
> > For Linux, I am using the PPTP-CLIENT that is
> > downloaded from http://pptpclient.sourceforge.net/
> .
> > 
> > I noticed that for my Windows boxes, they are able
> to
> > reach around 400-500kbps downloading from the VPN
> > server which is connected to the Internet via a
> > 512kbps leased line.
> > 
> > But for my Linux boxes, they are only able to
> reach
> > between 33kbps to 64kbps via the same connection
> as
> > the Windows clients. The leased line is totally
> > unsaturated at time of testing.
> > 
> > Does anyone have any idea what is the cause of
> this
> > wierd problem? Or have any performance enhancing
> tips
> > for Linux?
> > 
> > Many thanks in advance.
> > 
> > __________________________________________________
> > Do You Yahoo!?
> > Yahoo! Health - Feel better, live better
> > http://health.yahoo.com
> > 
> > _______________________________________________
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> >
>
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> > --- To unsubscribe, go to the url just above this
> line. --
> -- 
> Richard de Vroede
> (r.devroede at linvision.com)
> ------------------------------------------------
> Linvision BV         Provides Linux Solutions
> Elektronicaweg 16D
> 2628 XG Delft
> T: +31157502310      info at linvision.com
> F: +31157502319      http://devel.linvision.com
> ------------------------------------------------
> 
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