Scripting

NIC Teaming On Linux

Also known as NIC Teaming. The full install guide can be found here : Official Docs

vi /etc/modprobe.conf

Insert the following at the end : 

alias bond0 bonding
options bond0 mode=5 miimon=100 downdelay=200 updelay=200

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

This should read : 

DEVICE=eth0
#HWADDR=40:02:A5:49:17:A6 (Original MAC)
USERCTL=no
ONBOOT=yes
MASTER=bond0
SLAVE=yes
BOOTPROTO=none

Do the same for ifcfg-eth1

vi /etc/sysconfig/network-scripts/ifcfg-bond0 

DEVICE=bond0

IPADDR=192.168.1.1
NETMASK=255.255.255.0
NETWORK=192.168.1.0
BROADCAST=192.168.1.255
ONBOOT=yes
BOOTPROTO=none
USERCTL=no

It is not necessary to make a valid MAC up, the bond will use the MAC of the primary card.

then :

/etc/sysconfig/network restart

to check it works, 

[root@ferret ~]# cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v2.6.1 (October 29, 2004)

Bonding Mode: load balancing (round-robin)
MII Status: up
MII Polling Interval (ms): 0
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth0
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:02:a5:49:17:a6

Slave Interface: eth1
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:02:a5:49:17:a7