Set up bridge to connect to internet

Steps to set up bridge

Target: set up a bridge on the interface which connect to internet. Then we can attach other devices to the bridge to connect to internet.

1. Find out which interface connected to internet

ifconfig |grep 10.2

It will show the interface information, you can get the interface connected to internet, such as "enp6s0f0"

2. Add ifcfg-br0 file

cd /etc/sysconfig/network-scripts
vim ifcfg-br0

Edit the file as below

TYPE=Bridge
DEVICE=br0
ONBOOT=yes
NM_CONTROLLED=no
BOOTPROTO=dhcp
HOSTNAME="pengyuan.sh.intel.com"

Note: The hostname is your server's name. You can use the command 'hostname' to check it

3. Edit ifcfg-enp6s0f0 file

DEVICE=enp6s0f0
ONBOOT=yes
NM_CONTROLLED="no"
BRIDGE=br0

4. Update interface and bridge

ifup enp6s0f0
ifup br0

Then you may lost the ssh session, so go to lab to operate the machine.

./ifup-eth br0

Expected result: Determination of IP br0, then there is a dhclient process show that the hostname of br0

ps –aux|grep dhclient

5. Check brctl, see bridge connect to interface.

brctl show

Reboot the machine(but still find the issue that br0 not up, no IP connection)

6. Start the network

/etc/init.d/rc.d/init.d/ ./network start
chkconfig –list
chkconfig –level 2345 network on
chkconfig –list
systemctl stop NetworkManager.service
systemctl disable NetworkManager.service
killall dhclient
service restart network
killall dhclient
service restart network