This is a text-only version of the following page on https://raymii.org:
Title : Bonding NIC Teaming on Ubuntu 12.04
Author : Remy van Elst
Date : 14-02-2014
URL : https://raymii.org/s/tutorials/NIC_Bonding_on_Ubuntu_12.04.html
Format : Markdown/HTML
Bonding, also called port trunking or link aggregation means combining several
network interfaces (NICs) to a single link, providing either high-availability,
load-balancing, maximum throughput, or a combination of these.
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### Install required packages
`ifenslave` is used to attach and detach slave network interfaces to a bonding
device. Install the package:
apt-get install ifenslave
### Kernel Module
Before Ubuntu can configure your network cards into a NIC bond, you need to
ensure that the correct kernel module `bonding` is present, and loaded at boot
Edit the file:
Add the word `bonding` to the file:
Also, load the module manually for now:
### Bonding network config
Edit the file:
Example config for an round-robin load balancing setup:
iface lo inet loopback
iface eth0 inet manual
iface eth1 inet manual
iface bond0 inet static
# For jumbo frames, change mtu to 9000
bond-miimon 100 # Specifies the MII link monitoring frequency in milliseconds. This determines how often the link state
of each slave is inspected for link failures.
bond-downdelay 200 # Specifies the time, in milliseconds, to wait before disabling a slave after a link failure has bee
bond-updelay 200 # Specifies the time, in milliseconds, to wait before enabling a slave after a link recovery has been
bond-slaves none # we already defined the interfaces above with bond-master
For round-robin/load balancing, use `bond-mode: balance-rr`.
### Bonding modes explained
#### 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
#### 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.
* 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 (LACP) . 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.
* 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.
* documentation on linux network bonding:
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