Strange problem with configuration

[carlopmart]

Hi all,

  I have a strange problem with a bridge configuration on a Ubuntu LTS 
10.04.3 host. This host has three interfaces:

1/ eth0 --- Lan1
2/ eth1 --- Lan0
3/ eth2 --- Lan1

  I need to configure a bridge using eth1 and eth2. My 
/etc/network/interfaces:

auto eth0
iface eth0 inet static
         address 172.25.110.5
         netmask 255.255.255.240
         network 172.25.110.0
         broadcast 172.25.110.15
         gateway 172.25.110.1
         dns-nameservers 172.25.50.10
         dns-search hpulabs.org

auto eth1
iface eth1 inet manual

auto eth2
iface eth2 inet manual

auto br0
iface br0 inet manual
         bridge_ports eth1 eth2
         bridge_stp off
         bridge_hello 2
         bridge_fd 0
         bridge_maxage 12
         bridge_maxwait 0
         bridge_ageing 0

  But when I try to ping to this host from a desktop in the Lan0 doesn't 
works. Tcpdump doesn't shows traffic ... What am I doing wrong??

Thanks.

-- 
CL Martinez
carlopmart {at} gmail {d0t} com