June 15th, 2009 | 
Author: 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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Hi I have gotten bond0 to work but I am doing LACP on cisco switch and its set at gig speed but the bond0 is running at 100mb.
I have checked each card and they are both running at gig speed.
Do have any idea ?
You should use something similar :
#!/bin/bash
modprobe bonding mode=4 miimon=100 # load bonding module
ifconfig eth0 down # putting down the eth0 interface
ifconfig eth1 down # putting down the eth1 interface
ifconfig bond0 hw ether 00:11:22:33:44:55 # changing the MAC address of the bond0 interface
ifconfig bond0 10.100.100.0 up # to set ethX interfaces as slave the bond0 must have an ip.
ifenslave bond0 eth0 # putting the eth0 interface in the slave mod for bond0
ifenslave bond0 eth1 # putting the eth1 interface in the slave mod for bond0
You must define a “mode” for the bonding interface, because LACP use the 802.3ad Link aggregation protocol, so you must define it when loading module.
You should check this post to the different bonding modes :
http://www.riccardoriva.com/archives/353
Bye
Riccardo