NIC Bonding in RHEL5 (CentOS5 & OEL5)
NIC bonding allows multiple network cards to act as one, allowing increased bandwidth and redundancy.
Let's assume we have two network interfaces ("eth0" and "eth1") and we want to bond them so they look like a single interface ("bond0").
Add the following line to the "/etc/modprobe.conf" file.
alias bond0 bonding
The files defining the regular and bonding interfaces are located in the "/etc/sysconfig/network-scripts" directory. Create a new file called "ifcfg-bond0" for the bonding interface with the following contents (adjust the network parameters as applicable).
DEVICE=bond0 BOOTPROTO=none ONBOOT=yes NETWORK=192.168.2.0 NETMASK=255.255.255.0 IPADDR=192.168.2.131 USERCTL=no BONDING_OPTS="mode=1 miimon=100"
A description of the bonding options is available here.
Amend the existing "ifcfg-eth0" and "ifcfg-eth1" files, adding the "MASTER" and "SLAVE" parameters. The contents of these files should look like this.
#eth0 DEVICE=eth0 MASTER=bond0 SLAVE=yes USERCTL=no BOOTPROTO=none ONBOOT=yes #eth1 DEVICE=eth1 MASTER=bond0 SLAVE=yes USERCTL=no BOOTPROTO=none ONBOOT=yes
Restart the network service.
# service network restart Shutting down interface bond0: [ OK ] Shutting down loopback interface: [ OK ] Bringing up loopback interface: [ OK ] Bringing up interface bond0: [ OK ] #
The bonded interface can be displayed using the "ifconfig" command, which shows "bond0" running as the master and both "eth0" and "eth1" running as slaves.
# ifconfig
bond0 Link encap:Ethernet HWaddr 00:0C:29:0A:7D:5D
inet addr:192.168.2.131 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe0a:7d5d/64 Scope:Link
UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1
RX packets:15 errors:0 dropped:0 overruns:0 frame:0
TX packets:69 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:964 (964.0 b) TX bytes:16956 (16.5 KiB)
eth0 Link encap:Ethernet HWaddr 00:0C:29:0A:7D:5D
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:2 errors:0 dropped:0 overruns:0 frame:0
TX packets:67 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:152 (152.0 b) TX bytes:16860 (16.4 KiB)
Interrupt:59 Base address:0x2024
eth1 Link encap:Ethernet HWaddr 00:0C:29:0A:7D:5D
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:13 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:812 (812.0 b) TX bytes:96 (96.0 b)
Interrupt:67 Base address:0x20a4
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:1843 errors:0 dropped:0 overruns:0 frame:0
TX packets:1843 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2757348 (2.6 MiB) TX bytes:2757348 (2.6 MiB)
#For more information see:
Hope this helps. Regards Tim...
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