Riccardo Riva

Posts Tagged ‘bonding’

This simple post will show how to configure Ethernet Bonding on two (or more) network interfaces on RHEL 5 or CentOS 5.
I’ve tested this configuration on a CentOS 5.2 with kernel 2.6.18-92.1.22.el5 as you could see below :

uname -a

Linux serverlab.riccardoriva.local 2.6.18-92.1.22.el5 #1 SMP Tue Dec 16 11:57:43 EST 2008 x86_64 x86_64 x86_64 GNU/Linux

cat /etc/redhat-release
CentOS release 5.2 (Final)

If you want to create a bonding on two interface (i.e. eth0 and eth1) you should do the following :

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

# Bonding eth0 to bond0
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes
USERCTL=NO

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

# Bonding eth1 to bond0
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes
USERCTL=NO

Copy /etc/sysconfig/network-scripts/ifcfg-eth1 to /etc/sysconfig/network-scripts/ifcfg-bond0 to keep the same file permission by executing the following commands :

cd /etc/sysconfig/network-scripts
copy ifcfg-eth1 ifcfg-bond0

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

ifcfg-bond0
DEVICE=bond0
BOOTPROTO=none
ONBOOT=yes
NETWORK=10.100.100.0
NETMASK=255.255.255.0
IPADDR=10.100.100.1
USERCTL=NO

Edit /etc/modprobe.conf adding the following line :

alias bond0 bonding

Reboot your system to let modules be loaded or load it manually with the following command :

insmod bond0 bonding

If you haven’t rebooted your system, restart your network with the following command :

/etc/init.d/network restart

You should check if bonding is working you should look at /proc/net/bonding/bond0 with the following command :

cat /proc/net/bonding/bond0

and you should see something similar to the following :

Ethernet Channel Bonding Driver: v3.2.4 (January 28, 2008)

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: 00:15:17:88:5a:3c

Slave Interface: eth1
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:15:17:88:5a:3d

You’ve done

Hope this help

Bye
Riccardo

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