Hello Friends,
I am going to share post of NIC Bonding, By Using NIC bonding We can ‘bond’ two (or more) physical ethernet interfaces together to look and act as a single interface under Linux.
In My Case :- I have two Lan Card eth0 and eth1
First We need to create virtual lan file as bond0 using ip 192.168.11.20 :-
# vim /etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0
IPADDR=192.168.11.20
NETWORK=192.168.11.0
NETMASK=255.255.255.0
USERCTL=no
BOOTPROTO=none
ONBOOT=yes
:wq!
Save and Quit
Configure eth0 :-
# vim /etc/sysconfig/network-scripts/ifcfg-eth0
#Device name=eth0
DEVICE=eth0
ONBOOT=yes
MASTER=bond0
SLAVE=yes
BOOTPROTO=none
USERCTL=no
:wq!
Save and Quit
Configure eth1 :-
# vim /etc/sysconfig/network-scripts/ifcfg-eth1
#Device name=eth0
DEVICE=eth1
BOOTPROTO=none
USERCTL=no
ONBOOT=yes
MASTER=bond0
SLAVE=yes
wq!
Save and Quit
Configure Gateway:-
#vim /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=linux.sahil.com
GATEWAY=192.168.11.1 ##My Gateway for all interface
wq!
Save and Quit
Make some changes kernel modules configuration file:-
#vi /etc/modprobe.conf
alias bond0 bonding
options bond0 mode=balance-alb miimon=100
wq!
Save and Quit
Now Load bond module
# modprobe bonding
Now check loaded Module
#lsmod | grep bonding
Now Restart the network service:-
#/etc/init.d/network restart or service network restart
Now Check everything is working fine :-
# cat /proc/net/bonding/bond0
Bonding Mode: load balancing (round-robin)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 200
Down Delay (ms): 200
Slave Interface: eth0
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:09:0f:2e:c4:ce
Slave Interface: eth1
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:a0:d1:61:41:9d
Thats it … Now If One Network Card or Ethernet is down then No harm in Network We can work from other 🙂
🙂 Enjoy Linux-Ing 🙂