Configure bridge interface on CentOS

Install bridge command
$ sudo yum install bridge-utils

The brctl command howto

To create a bridge:

$ sudo brctl addbr br0

To remove a bridge:

$ sudo brctl delbr br0 

 

Add/ Remove interface in Bridge

To add an interface to a bridge:

$ sudo brctl addif br0 eth0

To remove an interface to a bridge:

$ sudo brctl delif br0 eth0 

 

Configure a permanent bridge interface on CentOS, RHEL or Fedora

You need to update existing eth0 configuration in /etc/sysconfig/network-scripts/ifcfg-eth0, and add bridge configuration in /etc/sysconfig/network-scripts/ifcfg-br100.

$ sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
TYPE=Ethernet
BRIDGE=br100

If eth0 has an IP address assigned by DHCP:

$ sudo vi /etc/sysconfig/network-scripts/ifcfg-br100

DEVICE=br100
TYPE=Bridge
ONBOOT=yes
DELAY=0
BOOTPROTO=dhcp
ONBOOT=yes
STP=no

If eth0 has a static IP address:

 

$ sudo vi /etc/sysconfig/network-scripts/ifcfg-br100 

 

DEVICE=br100
TYPE=Bridge
BOOTPROTO=static
IPADDR=<static_IP_address_of_eth0>
NETMASK=<netmask>
GATEWAY=<gateway>
ONBOOT=yes
STP=no