VirtualBox Host problem

[Christopher Bianchi]

hello ! i've correctly set up Ubuntu Server as guest on last version of
Sun Virtualbox (directly from repository virtualbox).

Only a problem:
from the host system, a Ubuntu 8.04 hardy (not server edition, with
guy), i can navigate, communicate to all, but i can't do only a thing:
ping outside from lan. 

i'll show you:

ienabellamy at charlotte:~$ ping www.google.it
PING www.l.google.com (74.125.39.104) 56(84) bytes of data.

--- www.l.google.com ping statistics ---
10 packets transmitted, 0 received, 100% packet loss, time 9009ms

So, the portforwarding (for bittorrent, emule etc...) for the HOST os,
NOT WORKS. So, the portforwarding (server web, ssh, etc..) for the GUEST
os, WORKS.

My /etc/network/interfaces is this:

#LOOPBACK INTERFACE
auto lo
iface lo inet loopback

#eth0 INTERFACE
auto eth0
iface eth0 inet manual 

#vbox0 INTERFACE
auto vbox0
iface vbox0 inet manual
    tunctl_user ienabellamy

#br0 INTERFACE
auto br0
iface br0 inet static
    post-up chmod 666 /dev/net/tun
    post-ip tunctl -t vbox0 -u ienabellamy
    address 192.168.1.10
    netmask 255.255.255.0
    broadcast 192.168.1.255
    gateway 192.168.1.1
    bridge-ports eth0 vbox0
    bridge-ageing 7200
    bridge-fd 0

Host and guest MUST use a static ip as you can see.

Anyone helps would be appreciate!