How to create nic channel bonding in redhat/centos/fedora linux.

Step 1: Creating Bonding Channel

As a root, create a new file name bonding.conf in the /etc/modprobe.d/ directory.

#cd  /etc/modprobe.d/

#vim bonding.conf

alias bond0 bonding

options bond0 mode=1 miimon=100

Save & exit

For each configured channel bonding interface, there must be a corresponding entry in your new /etc/modprobe.d/bonding.conf file.

Step 2: Creating Channle Bonding Interface

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

DEVICE=bond0

IPADDR=192.168.1.8

NETMASK=255.255.255.0

ONBOOT=yes

BOOTPROTO=none

USERCTL=no

Step 3: Configuring Channel Bonding Interface

For eth0

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

DEVICE=eth0

USERCTL=no

ONBOOT=yes

MASTER=bond0

SLAVE=yes

BOOTPROTO=none

For eth1

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

DEVICE=eth1

USERCTL=no

ONBOOT=yes

MASTER=bond0

SLAVE=yes

BOOTPROTO=none

Step 4: Restarting Network Service

Restart the network service and see the output of ifconfig.

# service network restart

[root@amir network-scripts]# ifconfig

bond0     Link encap:Ethernet  HWaddr 00:0C:21:60:30:C4

          inet addr:192.168.1.8  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

lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::1/128 Scope:Host

          UP LOOPBACK RUNNING  MTU:16436  Metric:1

          RX packets:2 errors:0 dropped:0 overruns:0 frame:0

          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0

          RX bytes:104 (104.0 b)  TX bytes:104 (104.0 b)