Bonding on RedHat 5 / CentOS 5

In the modprobe.conf file add the following:

alias bond0 bonding

options bond0 miimon=100 mode=1

Be sure to add this before any of the network aliases modes:

mode=0 (Balance Round Robin)

mode=1 (Active backup)

mode=2 (Balance XOR)

mode=3 (Broadcast)

mode=4 (802.3ad)

mode=5 (Balance TLB)

mode=6 (Balance ALB)

In the /etc/sysconfig/network-scripts/ directory create ifcfg-bond0

DEVICE=bond0

IPADDR=

NETMASK=

NETWORK=

BROADCAST=

GATEWAY=

ONBOOT=yes

BOOTPROTO=none

USERCTL=no

Change the ifcfg-eth0 to:

DEVICE=eth0

ONBOOT=yes

BOOTPROTO=none

USERCTL=no

MASTER=bond0

SLAVE=yes

Change the ifcfg-eth1 to:

DEVICE=eth1

ONBOOT=yes

BOOTPROTO=none

USERCTL=no

MASTER=bond0

SLAVE=yes

Check the status of the bond.  

cat /proc/net/bonding/bond0

You can use multiple bond interface but for that you must load the bonding module as many as you need. Presuming that you want two bond interface you must configure the /etc/modprobe.conf as follow:

 alias bond0 bonding

 alias bond1 bonding

 options bonding max_bonds=2

Also add in /etc/sysconfig/network-script/ifcfg-bond0 & bond1 below line

BONDING_OPTS="miimon=100 mode=1"