How to Configure Ethernet Bonding in RedHat/CentOS/Fedora

1 => Make master and slave entry in ifcfg-eth0 configuration file

#vim /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
MASTER=bond0
USERCTL=no
SLAVE=yes
BOOTPROTO=dhcp
TYPE=Ethernet
ONBOOT=yes
IPV6INIT=no

2  => Make master and slave entry in ifcfg-eth1 configuration file

#vim /etc/sysconfig/network-scripts/ifcfg-eth1

DEVICE=eth1
TYPE=Ethernet
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=dhcp
MASTER=bond0
SLAVE=yes
USERCTL=no
IPV6INIT=no

3 =>  Create a file in the /etc/sysconfig/network-scripts/ directory with ifcfg-bond0 name and put entry according to your network.

#vim /etc/sysconfig/network-scripts/ifcfg-bond0

DEVICE=bond0
IPADDR=192.168.1.135
GATEWAY=192.168.1.1
NETMASK=255.255.255.0
DNS1=8.8.8.8
#BONDING_OPTS="miimon=100 mode=1"
USERCTL=no
BOOTPROTO=none
ONBOOT=yes
TYPE=Ethernet
HWADDR=00:00:00:00:00:00
IPV6INIT=no

4 => As a root, create a new file name bonding.conf in the /etc/modprobe.d/ directory. You can use any name but it should be end with a .conf extension

#vim /etc/modprobe.d/bounding.conf

alias bond0 bonding
options bond0 miimon=100 mode=1 lacp_rate=1


#Save file and exit

5 => Update driver for bounding

#modprobe bonding


6 => Restart system and run below command to check


root@nirmal-server1]# cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.6.0 (September 26, 2009)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None
Currently Active Slave: eth0
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth0
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 08:00:27:38:9a:ef
Slave queue ID: 0

Slave Interface: eth1
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 1
Permanent HW addr: 08:00:27:23:2d:47
Slave queue ID: 0


7 =>  Check IP

[root@nirmal-server1]# ifconfig

bond0     Link encap:Ethernet  HWaddr 00:0C:21:60:30:C4
          inet addr:192.168.1.135  Bcast:172.16.1.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe69:31c4/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1
          RX packets:19676 errors:0 dropped:0 overruns:0 frame:0
          TX packets:342 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1623240 (1.5 MiB)  TX bytes:42250 (41.2 KiB)

eth0      Link encap:Ethernet  HWaddr 00:0C:21:60:30:C4
          UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
          RX packets:10057 errors:0 dropped:0 overruns:0 frame:0
          TX packets:171 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:832257 (812.7 KiB)  TX bytes:22751 (22.2 KiB)
          Interrupt:19 Base address:0x2000

eth1      Link encap:Ethernet  HWaddr 00:0C:21:60:30:C4
          UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
          RX packets:9620 errors:0 dropped:0 overruns:0 frame:0
          TX packets:173 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:791043 (772.5 KiB)  TX bytes:20207 (19.7 KiB)
          Interrupt:19 Base address:0x2080

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Enjoy !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!