Step 1. shutdown the interface (e.g. eth0)

# ifconfig eth0 down



Step 2: change the mac address to e.g. 11:22:33:44:55:66

# ifconfig eth0 hw ether 11:22:33:44:55:66



Step 3. restart the interface

# ifconfi [ ... ]

There are many ways how to get the current bandwidth usage on Linux. This is a very simple shell script that lists the network statistic every second: #!/bin/bash
if [ -z "$1" ]; then
       [ ... ]