On 2010年11月26日, in linux, by netoearth

The Linux bonding driver provides a method for aggregating multiple network interfaces into a single logical
bonded interface.The behavior of the bonded interfaces depends upon the mode; generally speaking, modes provide either hot standby or load balancing services.

Additionally, link integrity monitoring may be performed.

You have to install ifenslave, it is a tool to attach and detach slave network interfaces to a bonding device.

sudo apt-get install ifenslave

Configuring your network interfaces and modules

You need to edit /etc/network/interfaces file and make it looks like

sudo nano /etc/network/interfaces

Add the following (This is just example enter you ip details)

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static

iface eth1 inet manual

iface eth2 inet manual

auto bond0
iface bond0 inet static
bond_miimon  100
bond_mode balance-rr
up /sbin/ifenslave bond0 eth1 eth2
down /sbin/ifenslave -d bond0 eth1 eth2

Save and exit the file

Now you need to edit /etc/modprobe.d/aliases.conf file

sudo nano /etc/modprobe.d/aliases.conf

Add the following lines

alias bond0 bonding
options mode=0 miimon=100 downdelay=200 updelay=200

Save and exit the file

If you want more details about modes

mode=0 (balance-rr) Round-robin policy: Transmit packets in sequential order from the first available slave through the last. This mode provides load balancing and fault tolerance.

mode=1 (active-backup) Active-backup policy: Only one slave in the bond is active. A different slave becomes active if, and only if, the active slave fails. The bond’s MAC address is externally visible on only one port (network adapter) to avoid confusing the switch. This mode provides fault tolerance. The primary option affects the behavior of this mode.

mode=2 (balance-xor) XOR policy: Transmit based on [(source MAC address XOR’d with destination MAC address) modulo slave count]. This selects the same slave for each destination MAC address. This mode provides load balancing and fault tolerance.

mode=3 (broadcast) Broadcast policy: transmits everything on all slave interfaces. This mode provides fault tolerance.

mode=4 (802.3ad) IEEE 802.3ad Dynamic link aggregation. Creates aggregation groups that share the same speed and duplex settings. Utilizes all slaves in the active aggregator according to the 802.3ad specification.

* Pre-requisites:
* Ethtool support in the base drivers for retrieving the speed and duplex of each slave.
* A switch that supports IEEE 802.3ad Dynamic link aggregation. Most switches will require some type of configuration to enable 802.3ad mode.

mode=5 (balance-tlb) Adaptive transmit load balancing: channel bonding that does not require any special switch support. The outgoing traffic is distributed according to the current load (computed relative to the speed) on each slave. Incoming traffic is received by the current slave. If the receiving slave fails, another slave takes over the MAC address of the failed receiving slave.

* Prerequisite: Ethtool support in the base drivers for retrieving the speed of each slave.

mode=6 (balance-alb) Adaptive load balancing: includes balance-tlb plus receive load balancing (rlb) for IPV4 traffic, and does not require any special switch support. The receive load balancing is achieved by ARP negotiation. The bonding driver intercepts the ARP Replies sent by the local system on their way out and overwrites the source hardware address with the unique hardware address of one of the slaves in the bond such that different peers use different hardware addresses for the server.


=0: (balance-rr) Round-robin policy: (平衡抡循环策略):传输数据包顺序是依次传输,直到最后一个传输完毕, 此模式提供负载平衡和容错能力。

=1: (active-backup) Active-backup policy:(主-备份策略):只有一个设备处于活动状态。 一个宕掉另一个马上由备份转换为主设备。mac地址是外部可见得。 此模式提供了容错能力。

=2:(balance-xor) XOR policy:(广播策略):将所有数据包传输给所有接口。 此模式提供了容错能力。

=3:(balance-xor) XOR policy:(平衡策略): 传输根据原地址布尔值选择传输设备。 此模式提供负载平衡和容错能力。

=4:(802.3ad) IEEE 802.3ad Dynamic link aggregation.IEEE 802.3ad 动态链接聚合:创建共享相同的速度和双工设置的聚合组。

=5:(balance-tlb) Adaptive transmit load balancing(适配器传输负载均衡):没有特殊策略,第一个设备传不通就用另一个设备接管第一个设备正在处理的mac地址,帮助上一个传。

=6:(balance-alb) Adaptive load balancing:(适配器传输负载均衡):大致意思是包括mode5,bonding驱动程序截获 ARP 在本地系统发送出的请求,用其中之一的硬件地址覆盖从属设备的原地址。就像是在服务器上不同的人使用不同的硬件地址一样。

Restart network services using the following command

sudo /etc/init.d/networking restart

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