set_mac() {
  local interface=$1
  local mac_address=$2
  if has ifconfig; then
    current_mac=$(ifconfig "$interface" | awk '/ether/ {print $2}')
    if [[ "${current_mac,,}" == "${mac_address,,}" ]]; then
      return
    fi

    ifconfig "$interface" down
    if [[ "$OSTYPE" == "linux-gnu" ]]; then
      ifconfig "$interface" hw ether "$mac_address"
    else
      ifconfig "$interface" ether "$mac_address"
    fi
    ifconfig "$interface" up
  elif has ip; then
    ip link set dev "$interface" down
    ip link set dev "$interface" address "$mac_address"
    ip link set dev "$interface" up
  else
    die "no suitable program found to configure the network interface, need iproute2 or ifconfig"
  fi
}