RedHat Enterprise Linux 4 Network Bonding

1.  Edit /etc/sysconfig/network-scripts/ifcfg-bond0

DEVICE=bond0
IPADDR=xx.xx.xx.xx

NETWORK=xx.xx.xx.xxx

NETMASK=255.255.255.0

USERCTL=no

BOOTPROTO=none

ONBOOT=yes

2.  Edit /etc/sysconfig/network-scripts/ifcfg-eth0

Device=eth0

BOOTPROTO=none

ONBOOT=yes

USERCTL=no

TYPE=Ethernet

MASTER=bond0

SLAVE=yes

3.  Edit /etc/sysconfig/network-scripts/ifcfg-eth1

Device=eth1

BOOTPROTO=none

ONBOOT=yes

USERCTL=no

TYPE=Ethernet

MASTER=bond0

SLAVE=yes

4. Edit /etc/modprobe.conf  ( RHEL 4 only, do not modify on RHEL 5 )

alias bond0 bonding

options bond0 mode=1 miimon=100

5. Module probe.

$ modprobe bonding

6. Restart network 

$ service network restart

7. Check

$ less /proc/net/bonding/bond0

Bonding Mode: fault-tolerance (active-backup)

Primary Slave: None

Currently Active Slave: eth1

MII Status: up

MII Polling Interval (ms): 100

Up Delay (ms): 0

Down Delay (ms): 0

Slave Interface: eth0

MII Status: up

Link Failure Count: 1

Permanent HW addr: 00:19:bb:21:54:c0

Slave Interface: eth1

MII Status: up

Link Failure Count: 0

Permanent HW addr: 00:19:bb:21:54:ae

---
refer:
1.  /usr/share/doc/iputils-20020927/README.bonding
2. for RHEL 5 , refer: Channel Bonding Interface