We have the following scenario: - switch 48 ports (level 3) configured with two vlans - centOS server configured with 3 network cards, so we have 3 different interfaces. One of this interfaces (eth1) is directly connected to the router so we have internet connection. The other interface (eth0) is connected to a switch on one vlan. The last interface (eth2) is connected to the switch on the second vlan. Each interface has at least 2 virtual machines. We wanted internet connection on the virtual machines so we created a bridge between interfaces eth0 and eth2 to eth1 both (internet). All the connections are made property but just the virtual machine on eth2 doesn't have internet connection and I don't know why ... We supposed that the switch configuration is right. I think there is something missing on the centOS configuration, some file... but I can't see ... I show here the different configuration files: Interfaces: eth0 DEVICE=eth0 HWADDR=ff:ff:ff:ff:ff:ff ONBOOT=yes IPADDR="192.168.1.2" NETWORK="192.168.1.0" PREFIX=24 NETMASK="255.255.255.0" BRIDGE=bred1 NM_CONTROLLED=no eth2 DEVICE=eth2 HWADDR=ff:ff:ff:ff:ff:ff ONBOOT=yes IPADDR="192.168.2.2" NETWORK="192.168.2.0" PREFIX=24 NETMASK="255.255.255.0" BRIDGE=bred2 NM_CONTROLLED=no eth1 DEVICE=eth1 HWADDR=ff:ff:ff:ff:ff:ff BROADCAST=x.x.x.x ONBOOT=yes BOOTPROTO=static IPADDR=x.x.x.x NETMASK=255.255.255.0 NETWORK=x.x.x.x GATEWAY=x.x.x.x DNS1=188.8.131.52 DNS2=184.108.40.206 TYPE=Ethernet DOMAIN="name.local" Bridges : Bred1: DEVICE=bred1 TYPE=Bridge BOOTPROTO=static IPADDR="192.168.1.2" NETMASK="255.255.255.0" NETWORK="192.168.1.0" PREFIX=24 ONBOOT=yes DELAY=0 NM_CONTROLLED=no Bred2: DEVICE=bred2 TYPE=Bridge BOOTPROTO=static IPADDR="192.168.2.2" NETMASK="255.255.255.0" NETWORK="192.168.2.0" PREFIX=24 ONBOOT=yes DELAY=0 NM_CONTROLLED=no Virtual Machines on eth0: allow-hotplug eth0 interface eth inet static address: 192.168.1.3 gw: 192.168.1.2 netmask: 255.255.255.0 network: 192.168.1.0 broadcast: 192.168.1.255 Virtual Machines on eth2: allow-hotplug eth0 interface eth inet static address: 192.168.2.3 gw: 192.168.2.2 netmask: 255.255.255.0 network: 192.168.2.0 broadcast: 192.168.2.255 Thanks a lot for your time. I appreciate it. T.