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

[R. de Vroede]

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.
> 
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-- 
Richard de Vroede
(r.devroede at linvision.com)
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