Bonding? What is it? Well, this is
EtherChannel spoken in LINUX. To configure it, a host has to have at least two Ethernet adapters. If not sure what adapter is connected with the network you can turn it identification light on executing the next command which will “illuminate” the
eth3 (in this case) for fifteen seconds.
# ethtool -p eth3 15
The last command will turn the light off
ent3 interface after fifteen seconds. If NIC does not have ID light (led), pull out its network cable and watch the
/var/log/messages file for the appropriate entry – they will tell you what NIC lost network connectivity.
The reset is very simple. In LINUX, it seems that it is customary to name the “bonded” adapters
bond followed with a digit. For example the first “bonded” adapter is called
To configure it, execute the following steps:
a. Move to the
/etc/sysconfig/network-scripts directory and edit appropriate
ifcfg-* files to contain the following lines (the
DEVICE=eth0 BOOTPROTO=none ONBOOT=yes USERCTL=no NM_CONTROLLED=no MASTER=bond0 SLAVE=yes
It is the
MASTER statement that identifies the adapters common (bonded) entity which in this case is
b. edit the
ifcfg-bond0 to contain the following:
DEVICE=bond0 IPADDR=188.8.131.52 NETMASK=255.255.255.0 GATEWAY=184.108.40.206 ONBOOT=yes BOOTPROTO=none NM_CONTROLLED=no USERCTL=no BONDING_OPTS="mode=1 miimon=1000"
The values associated with addresses, netmask and gateway are site dependent and in your case will be different. The
BONDING_OPTS entry defines a space delimited list of the bonded adapter parameters:
miimon Specifies (in milliseconds) how often MII link monitoring occurs.
mode=1 Sets an active-backup policy for fault tolerance.
At boot time, to automatically load code making the
bonded adapters possible, we have to make sure to create the file in
bind0.conf which contains one line:
alias bond0 bonding
Finally, restart the network service.
# service network restart
And verify that
bond0 has the right components and IP address execute the next command.
# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP qlen 1000 link/ether ac:16:2d:89:4e:0c brd ff:ff:ff:ff:ff:ff 3: eth1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP qlen 1000 link/ether ac:16:2d:89:4e:0c brd ff:ff:ff:ff:ff:ff 4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000 link/ether ac:16:2d:89:4e:0e brd ff:ff:ff:ff:ff:ff 5: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000 link/ether ac:16:2d:89:4e:0f brd ff:ff:ff:ff:ff:ff 6: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP link/ether ac:16:2d:89:4e:0c brd ff:ff:ff:ff:ff:ff inet 10.26.4.50/24 brd 10.26.4.255 scope global bond0 inet6 fe80::ae16:2dff:fe89:4e0c/64 scope link valid_lft forever preferred_lft forever