1. Disable NetworkManager

# chkconfig NetworkManager off

# chkconfig network on# service NetworkManager stop# service network start

# ifdown eth0

2. Create a new bridge

a. Create a new network script file in the /etc/sysconfig/network-scripts/ directory.

This example creates a file named ifcfg-bridge0

# cd /etc/sysconfig/network-scripts/

# vi  ifcfg-bridge0DEVICE=bridge0TYPE=BridgeONBOOT=yesNM_CONTROLLED=yesBOOTPROTO=noneIPADDR=192.168.44.16PREFIX=24GATEWAY=192.168.44.200DNS1=210.22.84.3DEFROUTE=yesIPV4_FAILURE_FATAL=yesIPV6INIT=noDELAY=0

Note: The line, TYPE=Bridge, is case-sensitive. It must have uppercase 'B' and lower case 'ridge'

vi ifcfg-eth0DEVICE=eth0ONBOOT=yesNM_CONTROLLED=yesHWADDR=00:0C:29:87:79:59IPV6INIT=noBRIDGE=bridge0

ifup eth0

ifup bridge0

# brctl show

bridge name    bridge id        STP enabled    interfacesbridge0        8000.000c29877959    no        eth0virbr0        8000.525400e39bab    yes        virbr0-nic

3.Security configuration

Configure iptables to allow all traffic to be forwarded across the bridge.# iptables  -I  INPUT -i bridge0 -j  ACCEPT# service iptables  save# service iptables restart4.Dsiable STP on virbr0# brctl stp virbr0 off

# brctl show

bridge name    bridge id        STP enabled    interfacesbridge0        8000.000c29877959    no        eth0virbr0        8000.525400e39bab    no        virbr0-nic