NIC Bonding in centos 6.x /rhel 6.x

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This post is useful in case you have more then 1 NIC card but with poor speed e.g. 10 MBPS  and you require higher bandwidth transmission.

we can bind two or more NIC ( eth0,eth1,eth2........)   in one bonding interface to achieve a good bandwidth.

here is the steps to perform.

  1. Create bond0 config file:
    2. vi /etc/sysconfig/network-scripts/ifcfg-bond0
  2. Add the following lines:
    3. DEVICE=bond0

IPADDR=192.168.1.20

NETWORK=192.168.1.0

NETMASK=255.255.255.0

USERCTL=no

BOOTPROTO=none

ONBOOT=yes

(Replace above IP address with your actual IP address. Save file and exit to shell, esc :wq)
  3. Edit eth0 config file:
    4. vi /etc/sysconfig/network-scripts/ifcfg-eth0
  4. Add the following lines:
    5. DEVICE=eth0

USERCTL=no

ONBOOT=yes

MASTER=bond0

SLAVE=yes

BOOTPROTO=none
  5. Edit eth1 config file:
    6. vi /etc/sysconfig/network-scripts/ifcfg-eth1
  6. Add the following lines:
    7. DEVICE=eth1

USERCTL=no

ONBOOT=yes

MASTER=bond0

SLAVE=yes

BOOTPROTO=none
  7. Load the modules on boot:
    8. vi /etc/modprobe.conf
  8. Add the following lines: 
    9. alias bond0 bonding
options bond0 mode=balance-alb miimon=100
     
     
    If you want to troubleshoot ( if having problem with bonding ) follow bellow steps-
    1. Load the modules, restart the network show the satus of the interface:
      2. modprobe bonding && service network restart && less /proc/net/bonding/bond0
    2. Output:
      3. 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: 00:0c:29:c6:be:59

Slave Interface: eth1
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:0c:29:c6:be:63
    3. list the interfaces seen by the system:
      4. ifconfig
    4. Output:
      5. bond0     Link encap:Ethernet  HWaddr 00:0C:29:C6:BE:59
 inet addr:192.168.1.20  Bcast:192.168.1.255  Mask:255.255.255.0
 inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
 UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
 RX packets:2804 errors:0 dropped:0 overruns:0 frame:0
 TX packets:1879 errors:0 dropped:0 overruns:0 carrier:0
 collisions:0 txqueuelen:0
 RX bytes:250825 (244.9 KiB)  TX bytes:244683 (238.9 KiB)

eth0      Link encap:Ethernet  HWaddr 00:0C:29:C6:BE:59
 inet addr:192.168.1.20  Bcast:192.168.1.255  Mask:255.255.255.0
 inet6 addr: fe80::20c:29ff:fec6:be59/64 Scope:Link
 UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
 RX packets:2809 errors:0 dropped:0 overruns:0 frame:0
 TX packets:1390 errors:0 dropped:0 overruns:0 carrier:0
 collisions:0 txqueuelen:1000
 RX bytes:251161 (245.2 KiB)  TX bytes:180289 (176.0 KiB)
 Interrupt:11 Base address:0x1400

eth1      Link encap:Ethernet  HWaddr 00:0C:29:C6:BE:59
 inet addr:192.168.1.20  Bcast:192.168.1.255  Mask:255.255.255.0
 inet6 addr: fe80::20c:29ff:fec6:be59/64 Scope:Link
 UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
 RX packets:4 errors:0 dropped:0 overruns:0 frame:0
 TX packets:502 errors:0 dropped:0 overruns:0 carrier:0
 collisions:0 txqueuelen:1000
 RX bytes:258 (258.0 b)  TX bytes:66516 (64.9 KiB)
 Interrupt:10 Base address:0x1480
     
 

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