Linux NIC Bonding

• Mode 1 (active-backup)

Mode 1 places one of the interfaces into a backup state and will only make it active if the link is lost by the active   interface. Only one slave in the bond is active at an instance of time. A different slave becomes active only when the   active slave fails. This mode provides fault tolerance.

sudo vi /ete/sysconfig/network-scritpts/ifcfg-bond0

DEVICE=”bond0’’

BOOTPROTO=none

HARDWARE=

ONBOOT=yes

ip address =192.168.178.1

netmask=255.255.255.0

gateway=192.168.10.1

TYPE=’’Bond’’

Prefer interface Primary Slave

BONDING_OPTS=’’mode=1 miimon=100  primary=ens3’’

sudo vi /ete/sysconfig/network-scritpts/ifcfg-ens3

DEVICE=”ens3’

BOOTPROTO=none

HARDWARE=0c:85:e0:f3:ab:00

ONBOOT=yes

MASTER=bond0

#ip address =192.168.x.x

#netmask=255.255.255.0

#gateway=192.168.x.x

TYPE=’’Ethernet’’

sudo vi /ete/sysconfig/network-scritpts/ifcfg-ens4

DEVICE=”ens4’

BOOTPROTO=none

HARDWARE=0c:85:e0:f3:ab:01

ONBOOT=yes

MASTER=bond0

#ip address =192.168.x.x

#netmask=255.255.255.0

#gateway=192.168.x.x

TYPE=’’Ethernet’’

cat /proc/net/bonding/bond0

Ping  Server 1 – 192.168.178.1

Ping  Server 2 – 192.168.178.2