Product SiteDocumentation Site

4.2.2. Channel Bonding Interfaces

Fedora allows administrators to bind multiple network interfaces together into a single channel using the bonding kernel module and a special network interface called a channel bonding interface. Channel bonding enables two or more network interfaces to act as one, simultaneously increasing the bandwidth and providing redundancy.
To create a channel bonding interface, create a file in the /etc/sysconfig/network-scripts/ directory called ifcfg-bond<N> , replacing <N> with the number for the interface, such as 0.
The contents of the file can be identical to whatever type of interface is getting bonded, such as an Ethernet interface. The only difference is that the DEVICE= directive must be bond<N> , replacing <N> with the number for the interface.
The following is a sample channel bonding configuration file:
BONDING_OPTS="<bonding parameters separated by spaces>"
Example 4.1. Sample ifcfg-bond0 interface configuration file

After the channel bonding interface is created, the network interfaces to be bound together must be configured by adding the MASTER= and SLAVE= directives to their configuration files. The configuration files for each of the channel-bonded interfaces can be nearly identical.
For example, if two Ethernet interfaces are being channel bonded, both eth0 and eth1 may look like the following example:

In this example, replace <N> with the numerical value for the interface.
For a channel bonding interface to be valid, the kernel module must be loaded. To ensure that the module is loaded when the channel bonding interface is brought up, add the following line to /etc/modprobe.conf:
alias bond<N> bonding

Replace <N> with the number of the interface, such as 0.

Important: put all bonding module parameters in ifcfg-bondN files

Parameters for the bonding kernel module must be specified as a space-separated list in the BONDING_OPTS="<bonding parameters>" directive in the ifcfg-bond<N> interface file. They should not be placed in /etc/modprobe.conf. For further instructions and advice on configuring the bonding module and to view the list of bonding parameters, refer to Section 29.5.2, “The Channel Bonding Module”.