Here is how you enable 802.x tagging on your Centos host cat /etc/sysconfig/network-scripts/ifcfg-vlan100 VLAN=yes VLAN_NAME_TYPE=VLAN_PLUS_VID_NO_PAD DEVICE=vlan100 PHYSDEV=eth5 BOOTPROTO=static ONBOOT=yes TYPE=Ethernet IPADDR=192.168.200.254 NETMASK=255.255.255.0