Indirect connection works better

Philip Herlihy Philip at Herlihy.eu.com
Thu May 14 17:56:26 BST 2009


Thanks, Wez,

In fact both routes use WiFi for the last leg, but your point about MTU is
an interesting one.  How do I assess the "real and imaginary" MTUs?

(Offline for 24 hours from now, but still interested!) 


Philip Herlihy	 


-----Original Message-----
From: James Weatherall [mailto:jnw at realvnc.com] 
Sent: 14 May 2009 17:24
To: 'Philip Herlihy'; vnc-list at realvnc.com
Subject: RE: Indirect connection works better

Hi Philip,

Sorry to hear that.  The difference you've highlighted is that the "target"
machine is on Wi-Fi, not cable, which can cause issues.  You might also
check, for instance, what the target computer thinks the MTU of the Wi-Fi
network is, and compare that to what it really is - if it's smaller than the
server thinks it is then the connection is likely to stall as soon as a
significant amount of data gets transferred.

Regards,

--
Wez @ RealVNC Ltd


> -----Original Message-----
> From: vnc-list-bounces at realvnc.com [mailto:vnc-list-
> bounces at realvnc.com] On Behalf Of Philip Herlihy
> Sent: 14 May 2009 17:09
> To: vnc-list at realvnc.com
> Subject: RE: Indirect connection works better
> 
> Thanks, Wez - however, in response to guidance you gave me once before
> I
> already have that setting enabled.
> 
> What puzzles me is that either route is using the same links, so it's
> hard
> to understand what the difference might be.
> 
> 
> Philip Herlihy
> 
> 
> 
> -----Original Message-----
> From: vnc-list-bounces at realvnc.com [mailto:vnc-list-
> bounces at realvnc.com] On
> Behalf Of James Weatherall
> Sent: 14 May 2009 16:21
> To: 'Philip Herlihy'; vnc-list at realvnc.com
> Subject: RE: Indirect connection works better
> 
> Hi Philip,
> 
> Some Wi-Fi routers have trouble handling large numbers of small network
> packets, such as are produced when moving the mouse around in the VNC
> session, and that in turn can upset the Windows TCP stack and lead to
> the
> sort of behaviour you're seeing.
> 
> You can enable the "Pointer event rate-limiting" feature in the VNC
> Viewer
> to work around this problem.
> 
> Cheers,
> 
> --
> Wez @ RealVNC Ltd
> 
> 
> > -----Original Message-----
> > From: vnc-list-bounces at realvnc.com [mailto:vnc-list-
> > bounces at realvnc.com] On Behalf Of Philip Herlihy
> > Sent: 14 May 2009 15:34
> > To: vnc-list at realvnc.com
> > Subject: Indirect connection works better
> >
> > Recent came across a situation again which has puzzled me in the
> past.
> > I'm
> > trying to connect to a machine running VNC Free edition in an office.
> > I can
> > make the connection (having set up port forwarding on the router) but
> > it
> > hangs, with only the top third of the screen visible after several
> > minutes.
> > Further attempts produced the same result.
> >
> > That office has a workstation used as a simple workstation.  Unlike
> the
> > "target" machine, which is wirelessly connected, this one is
> connected
> > to
> > the router by cable.  I can connect reliably to the fileserver PC.  I
> > found
> > that within my remote session I could start a new session from the
> > fileserver PC to the target PC, and this worked well.
> >
> > Now that's using the same links, but in two jumps instead of one.
> > What's
> > going on?
> >
> > Phil, London
> > _______________________________________________
> > VNC-List mailing list
> > VNC-List at realvnc.com
> > To remove yourself from the list visit:
> > http://www.realvnc.com/mailman/listinfo/vnc-list
> 
> 
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