Linux NIC Bonding

I had a query on how to setup NIC bonding in RHEL4 so thought I would document it for the blog.

I'll start with a standard server with 2 NICs, eth0 and eth1. Here is the output from 'ifconfig':

The configuration scripts are found in /etc/sysconfig/network/network/scripts:

eth0 is a static interface configured in /etc/sysconfig/network/network-scripts/ifcfg-eth0:

eth1 is a static interface configured in /etc/sysconfig/network/network-scripts/ifcfg-eth1

The hardware is configured in /etc/modprobe.conf:

First we add a config file for bond0, /etc/sysconfig/network/network-scripts/ifcfg-bond0:

Now we edit /etc/sysconfig/network/network-scripts/ifcfg-eth0:

Now we edit /etc/sysconfig/network/network-scripts/ifcfg-eth1:

Network scripts are now complete in /etc/sysconfig/network/network-scripts:

Add the bonding driver to /etc/modprobe.conf:

Shut down the network with 'service network stop'
Insert the bonding driver with 'modprobe bonding -o bond0 miimon=100 mode=1'
Start the network with 'service network start':

Check the interfaces with 'ifconfig':

Check the routing is ok with 'route -n':

View the status with 'cat /proc/net/bonding/bond0':