#!/bin/bash

# ranmac - by dual
# boot time random spoof
# usage: use in your networking script, e.g.
#         /sbin/ifconfig eth1 hw ether `ranmac` in
#         Slackware's /etc/rc.d/rc.inet1

# Declare variables
cnt=0
low=16
maxcnt=6

# Generate and print random mac
ranmac()
{
        num=0
        while [ "$num" -lt "$low" ]; do
                num=$RANDOM
                let "num %=256"
        done
        printf "%X:" "$num"
}

while [ "$cnt" -lt "$maxcnt" ]; do
        devran=$(head -1 /dev/urandom | od -N 1 | awk '{ print $2 }')
        RANDOM="$devran"
        ranmac
        let "cnt += 1"
done