I'm running a Windows Server 2008 R2 guest under Windows 7 64-bit
with VirtualBox 4.1.2. Network is set to bridged, using my
computer's wifi connection (Centrino Advanced-N 6205). Virtualization
extensions are enabled in host BIOS.

When the guest is turned off, all traffic from the host to other
machines works fine and always has.

When the guest is running, the host and guest seem to "compete"
for traffic. If I start a cmd window in both host and guest and
start an identical infinite "ping /t <othermachine>" in them, it
is perfectly clear that first the host is able to ping fine but
the guest consistently gets "Request timed out", and 30 seconds
later the host starts getting "Request timed out" but the guest
starts to get the packets flowing. And then they switch back
like 20 seconds later, and so on and so forth. At no time are
they able to transmit at the same time. The time between switches 
seem to be completely random, but fairly short (less than a minute
on average).

Any ideas what may be causing this? It's infuriating, since this
keeps killing remote desktop connections to the guest which we are
relying for in a current project.

Thanks,
/Fredrik


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