Linux under multiple NIC bonding

First, what is bonding

Bonding, is to bind multiple network cards to the same IP address to provide services, can achieve high availability or load balancing. Of course, it is not possible to set the same IP address directly for two NICs. Through the bonding, the virtual one network card provides the connection externally, the physical network card is modified to the same MAC address.

Ii. Several working modes of bonding

Mode 0 (BALANCE-RR)
Rotation (round-robin) strategy: Send packets above and below each slave interface in a sequential order. This mode provides load balancing and fault tolerance capabilities
Mode 1 (active-backup)
Active-Backup (Master) policy: In the binding, only one slave is activated. Other slave are activated when and only if the active slave interface fails. To prevent the switch from confusing, the bound MAC address is visible on only one external port
Mode 3 (broadcast)
Broadcast strategy: All messages are transmitted on all slave interfaces. This mode provides fault-tolerant capability.

Iii. Mode1 Configuration demo in bonding

1, first add a network card on the virtual machine

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[[email protected] ~]# ifconfig  -a        // ifconfig -a  View all network card devices eth0      link encap:ethernet   Hwaddr 00:0c:29:9c:63:16            inet  addr:10.1.252.122  Bcast:10.1.255.255  Mask:255.255.0.0           inet6 addr: fe80::20c:29ff:fe9c:6316/64 Scope:Link           UP BROADCAST RUNNING MULTICAST   mtu:1500  metric:1          rx packets :111504 errors:0 dropped:0 overruns:0 frame:0           TX packets:1487 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000            RX bytes:8815045  (8.4 MIB)   TX bytes:176077  (171.9 kib) eth1       Link encap:Ethernet  HWaddr 00:0C:29:9C:63:20        Added success!           BROADCAST MULTICAST  MTU:1500   metric:1          rx packets:0 errors:0  dropped:0 overruns:0 frame:0          tx  packets:0 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000            RX bytes:0  (0.0 b)   TX bytes:0  (0.0 b) 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:65536  metric:1           rx packets:0 errors:0 dropped:0  overruns:0 frame:0          tx packets:0  errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:0           rx  bytes:0  (0.0 b)   TX bytes:0  (0.0 b)

Ii. creating a configuration file for the bonding device

[Email protected] ~]# vi/etc/sysconfig/network-scripts/ifcfg-bond0device=bond0ipaddr=10.1.0.222netmask= 255.255.0.0gateway=10.1.0.1dns1=114.114.114.114bonding_opts= "Miimon=100 mode=1"

Third, create the configuration file of network card

[Email protected] ~]# cat/etc/sysconfig/network-scripts/ifcfg-eth*device= "eth0" slave=yesmaster=bond0device= "eth1 "Slave=yesmaster=bond0[[email protected] ~]#

Four, restart the network card configuration file and test

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ping10.1.0.222 this host

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Then disconnect eth0 this NIC

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View the information at this time

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Then disconnect the eth1, and then ping the host

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Because the two network cards are disconnected, so no one to provide services, let us once again to connect the eth0, and then ping the host again

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Experimental success!! Thanks for browsing!!

This article is from the "Endless Learning" blog, please be sure to keep this source http://dashui.blog.51cto.com/11254923/1846417

Linux under multiple NIC bonding