network bridge

[amiasnikov]

I have server (debian 8 Jessie) with physical interface eth0 192.168.1.0/24
virtual bridge with (lxc) virtual machines: brctl addif tap0 br1; br1 192.168.2.0/24
eth0 not in bridge with br1
routing between eth0 & br1

lxc and qemu machines works fine with this bridge(br1).

But, virtualbox with this bridge(br1) works only to one direction:
- I can reach any host in any network from virtualbox guest (Linux, FreeBSD, Windows)
- guest host on VBox is unreachable from network, but available from host system on which VirtualBox installed

Virtualbox works fine if I select to use physical eth0 interface.

I can't understand what I'm wrong. Or I found VirtualBox bug?