On Tuesday 30 Jul 2013 07:45:39 Helmut Jarausch wrote:
> Hi,
> 
> I've been running a Windows 7 (professional)guest  with Virtualbox on my
> GenToo system for some years.
> But recently I have a broken network either due to Virtualbox or due to
> some
> (automatic) Windows updates.
> 
> The situation is more than strange.
> 
> Sometime using a backed up Virtualbox image the network seems to work
> but only for
> a very short time (some minutes?)
> 
> Windows error analyzing tools don't see any network problems but it
> does not work.
> 
> Trying ping -n 100 <IP>  only a few packets come back but with a large
> delay (40-50 times
> larger delay compared to ping on the GenToo host)


Does ifconfig show dropped packets/errors?

Is the mtu the same on MSWindows and Linux host and router?

MSWindows can corrupt its TCP/IP stack, or if you try to modify its parameters 
too much (size of receive/send window et al) things could go wrong.  There is 
some Microsoft fix file for this (I recall one available for WinXP at least) 
which resets the stack to its default values.

On the odd occasion I had to stop/start an MSWindows connection which would 
not come up on boot up, but this hasn't happened for quite some time now.  It 
might have been dodgy firmware on my router; I don' know and never found out 
what was the cause of it, because it only happened a few times.
-- 
Regards,
Mick