Create a Bridge interface under CentOS/RHEL/Fedora

ifcfg-eth0 :

DEVICE=eth0
ETHTOOL_OPTS=”autoneg off speed 100 duplex full”
HWADDR=00:19:B9:1D:2A:AA
ONBOOT=yes
BRIDGE=br0

ifcfg-br0 :

DEVICE=br0
TYPE=Bridge
BOOTPROTO=dhcp
DELAY=0