Nethence Newdoc Olddoc Lab Your IP BBDock  


Warning: those guides are mostly obsolete, please have a look at the new documentation.

UnixWindowsOracleObsoleteHardwareDIYMechanicsScriptsConfigs

Network interface bonding
 
 
On Redhat systems
First, note down your MAC addresses to keep track of what's going on once bonding is activated,
ifconfig eth0 | grep HWaddr
ifconfig eth1 | grep HWaddr
then create a virtual network interface configuration,
cd /etc/sysconfig/network-scripts
vi ifcfg-bond0
for example,
DEVICE=bond0
IPADDR=192.168.1.1
NETMASK=255.255.255.0
ONBOOT=yes
Note you can also specify “GATEWAY=” here or in the /etc/sysconfig/network configuration file.
 
Backup the old interfaces configurations,
cd /etc/sysconfig/network-scripts
mv ifcfg-eth0 OLD.ifcfg-eth0
mv ifcfg-eth1 OLD.ifcfg-eth1
Note it's preferable not to start your own filenames with ifcfg (scripts are going to parse them) hence the “OLD” prefix.
 
Create the interfaces configurations,
cd /etc/sysconfig/network-scripts
vi ifcfg-eth0
for example,
DEVICE=eth0
MASTER=bond0
SLAVE=yes
ONBOOT=yes
then,
vi ifcfg-eth1
for example,
DEVICE=eth1
MASTER=bond0
SLAVE=yes
ONBOOT=yes
 
Add the bonding configuration,
vi /etc/modprobe.conf
alias bond0 bonding
options bond0 miimon=100 mode=1
Note mode=1 is for HA failover. mode=0 is for load balancing (teaming)
Note miimon=100 means the link is going to be checked every 100 milliseconds
 
At last restart the network,
service network restart
Note the bonding module is loaded automaticly, just like any other network interface module,
lsmod | grep bond
 
For other /etc/modprobe.conf parameters,
modinfo bonding
Note it's always possible to unload and reload the bonding module while concerned interfaces are down, just like other network interface modules,
service network stop
rmmod bonding
modprobe bonding
service network start
 
To see what's going on when you unplug a cable,
tail -F /var/log/messages
To check if a interface is currently enslaved, trying to enslave it manually will tell you,
ifenslave bond0 eth0
Ref. man ifenslave
or just look into,
cat /proc/net/bond0/info
 

(obsolete, see the new doc)