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The *kernel-doc* RPM also documents port bonding in the file ``/usr/share/doc/kernel-doc-*/Documentation/networking/bonding.txt``.

Using Multiple Ethernet Cards

Some machines, especially servers, are equipped with dual Ethernet ports on the motherboard. In order to use both ports for increased bandwidth and/or redundancy, Linux must be configured appropriately.

You should consult this very nice overview of the Linux bonding driver and the Linux Ethernet Bonding Driver HOWTO. The kernel-doc RPM also documents port bonding in the file /usr/share/doc/kernel-doc-*/Documentation/networking/bonding.txt.

For Redhat RHEL 4 Linux this is documented in A.3.1. Using Multiple Ethernet Cards and 8.2.3. Channel Bonding Interfaces.

Loading the bonding kernel module

Read the A.3.2.1. bonding Module Directives manual.

Add this line to /etc/modprobe.conf (not /etc/modules.conf as documented):

alias bond0 bonding
options bond0 mode=6 miimon=100

with suitable parameters such as miimon as documented. The mode=6 refers to:

Sets an Active Load Balancing (ALB) policy for fault tolerance and load balancing.
Includes transmit and receive load balancing for IPV4 traffic.
Receive load balancing is achieved through ARP negotiation.

Modifying network scripts

In /etc/sysconfig/network-scripts/ new script files should be created:

  1. Create a new bonding device script file ifcfg-bond0 containing:

    DEVICE=bond0
    BOOTPROTO=dhcp
    ONBOOT=yes
    USERCTL=no
  2. The normal Ethernet interface scripts ifcfg-ethN should turn eth0 and eth1 into slave devices:

    DEVICE=eth0
    ONBOOT=yes
    BOOTPROTO=dhcp
    MASTER=bond0
    SLAVE=yes
    USERCTL=no
and similarly for eth1.

When using systemimager to clone the nodes these steps can be performed automatically using post-install scripts, e.g., /var/lib/systemimager/scripts/post-install/20q.eth_bonding_config script for the step 2.:

#!/bin/sh

# Get the Systemimager variables
. /tmp/post-install/variables.txt

# Name of the central server on this network
SERVER=audhumbla1
DOMAINNAME=dcsc.fysik.dtu.dk

# Correct the SystemImager eth0 config, turning eth0 into an Ethernet bonding device (bond0=eth0+eth1)
cp -p /etc/sysconfig/network-scripts/ifcfg-eth0 /tmp/ifcfg-eth0.BAK
cat <<EOF > /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=dhcp
MASTER=bond0
SLAVE=yes
USERCTL=no
EOF

# Finished
cd

Restart network services

At this stage the network should be restarted by service network restart, or the system should be rebooted, in order to activate the bond0 device in stead of the normal eth0 device.

Niflheim: MultipleEthernetCards (last edited 2017-01-06 09:15:53 by OleHolmNielsen)