Howto SetUp Dual NIC Bonding On Debian & Ubuntu
Bonding is creation of a single bonded interface by combining 2 or more ethernet interfaces. This helps in high availability and performance improvement.
How to setup dual-dual bonding (two bonds of two interfaces each) on Ubuntu as quickly as possible.
1. Add two lines to /etc/modules
bonding bond0 -o bond0 mode=1 miimon=100
bonding bond1 -o bond1 mode=1 miimon=100
If you’re very good at managing your time, just remember that miimon’s option determines how often the bond is monitored for failure and that mode can be one of:
0 – Round robin balancing
1 – Active back-up
2 – Transmit based on MAC address for load balancing/fault tolerance
3 – Broadcasting – provides fault tolerance by transmitting on all slave interfaces
4 – Aggregates links, assuming all nics support same speeds and duplex settings
5 – Transmit load balancing – balancing is handled by the bond based on load
6 – Same as 5, but also uses arp to balance load “better
2. Install the ifenslave package if you haven’t already. You can use apt-get to grab it if you don’t:
sudo apt-get install ifenslave-x.x
3. Ensure that the package actually installed:
sudo dpkg –get-selections | grep enslave
ifenslave-x.x install
4. Set up your interface files:
# cat /etc/network/interfaces (only including the parts you probably need – substitute IP addresses, netmasks, etc):
auto lo
iface lo inet loopback
auto bond0
iface bond0 inet static
address 10.10.125.88
netmask 255.255.255.0
network 10.10.125.0
gateway 10.10.125.1
post-up ifenslave bond0 eth0 eth2
pre-down ifenslave -d bond0 eth0 eth2
auto bond1
iface bond1 inet static
address 10.10.127.88
netmask 255.255.255.0
network 10.10.127.0
gateway 10.10.127.1
post-up ifenslave bond1 eth1 eth3
pre-down ifenslave -d bond1 eth1 eth3
5. Add lines to the bottom of your architecture’s modprobe files, reboot and pray:
sudo cat /etc/modprobe.d/arch/i386
alias bond0 bonding
options bond0 mode=1 miimon=5000 max_bonds=2
alias bond1 bonding
options bond1 mode=1 miimon=5000 max_bonds=2
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