#!/bin/bash

modprobe bonding mode=4 miimon=100 # load bonding module

ifconfig eth0 down # putting down the eth0 interface
ifconfig eth1 down # putting down the eth1 interface

ifconfig bond0 hw ether 00:11:22:33:44:55 # changing the MAC address of the bond0 interface
ifconfig bond0 10.100.100.0 up # to set ethX interfaces as slave the bond0 must have an ip.

ifenslave bond0 eth0 # putting the eth0 interface in the slave mod for bond0
ifenslave bond0 eth1 # putting the eth1 interface in the slave mod for bond0

You must define a “mode” for the bonding interface, because LACP use the 802.3ad Link aggregation protocol, so you must define it when loading module.

You should check this post to the different bonding modes :

http://www.riccardoriva.com/archives/353

Bye
Riccardo