Marc Haber <mh+vbox-users-community@...> writes:

> 
> On Sat, Jun 04, 2011 at 12:52:01PM -0700, JD wrote:
> > On 06/04/11 12:21, Marc Haber wrote:
> > > When I try the exact same thing with an exactly identically configured
> > > kernel 2.6.38.7, everything is fine. 2.6.39's bridges themselves seem
> > > to be OK, a KVM guest can use the very same setup just fine.
> >
> > Did you check you firewall (/etc/sysconfig/iptables)
> > to allow all traffic to the VM's subnet?
> 
> No. It is clear that the packet filter cannot play in this game here
> since
> 
> - switching back to an older kernel (with the kernel being the _only_
>   change) makes things work
> - KVM with identically configured networking works.
> 
> > Perhaps networking/firewall gurus have a more elegant way to set up 
> > these rules.
> 
> Use ferm.
> 
> Greetings
> Marc
> 
Same setup and problem here, but I found a fix:
Add vboxnet0 to br0:

# brctl addif br0 vboxnet0

This resolved all my issues with the 2.6.39-* kernel and VirtualBox 4.0.8.

Greetings,
Christoph



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