Re: Help with troubleshooting performance issue

Yes but James is 100% correct PPTP should no longer be called a 'VPN' 
instead a 'VN' for virtual network, as the 'private' part is so insecure 
its almost useless.  I myself finally got around to setting up openVPN 
and it wasn't that hard at all.  The client part is a bit more work, but 
still really worth it in the long run.

~Phil
On 4/2/2013 4:40 AM, Greg Scott wrote:
> Its a shame everyone is dropping suppport for pptp.  Nothing else is 
> easier to setup on Windows clients.
>
>
> Sent from my Verizon Wireless 4G LTE Smartphone
>
>
>
> -------- Original message --------
> From: James Cameron <[email protected]>
> Date: 04/02/2013 1:04 AM (GMT-06:00)
> To: Jafaruddin Lie <[email protected]>
> Cc: [email protected]
> Subject: Re: [Poptop-server] Help with troubleshooting performance issue
>
>
> On Tue, Apr 02, 2013 at 04:37:06PM +1100, Jafaruddin Lie wrote:
> > And if I get this correct, this could be because of the contention
> > between pptp daemon and other user-space processes?
>
> Yes, that is possible, but you would need to instrument the daemon to
> prove it.
>
> > I did top command while the transfer was going.  On both machines,
> > the load average didn't go above 0.08 for both machines, and CPU %us
> > on both machines didn't go above 9%.
>
> Sounds like the only contention will be between SCP, FTP and PPTP.
> You might try operating SCP and FTP on another host instead of the
> host running PPTP.  That is how most PPTP deployments would work.
>
> (In other words, using SCP or FTP on the same host may be invalidating
> your results, since PPTP is rarely used in that way.)
>
> > Sorry to be banging on about this again, but I do want to re-confirm.
> > Do you mean you won't be suprised if ppptp might not sustaion a
> > bandwidth of more than a tenth of native link bandwidth?
> > From what you wrote, I gather that pptp *should* be able to sustain
> > traffic more than a tenth of native link bandwidth.
>
> Actually, I would not be surprised either way.  CentOS 6 is reasonably
> recent, and the changes in kernel since my previous tests would
> invalidate my tests and my experience.  I doubt there has been any
> rigorous testing of PPTP with recent releases of CentOS or Ubuntu,
> because nobody should care much about PPTP anymore, as it is so
> insecure.
>
> So I shall re-estimate and restate; I would not be surprised if the
> bandwidth via tunnel is between 0.05 and 0.95 of the native bandwidth.
>
> I would be surprised if it was greater than 0.95.  I would be very
> critical of any result that shows a value greater than 1.00, or less
> than 0.05.
>
> Greg's results fit nicely into my not-surprised zone.
>
> > I have also tested this with a Ubuntu server on different machine
> > (same deal), with Windows client, and OS X client. They all give me
> > almost the same result, some slightly faster than the other.
>
> That's great.  Have you tried a Windows server or an OS X server?
>
> -- 
> James Cameron
> http://quozl.linux.org.au/ 
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