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ijeff@lemdro.id

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MAC randomisation help (self.openwrt)

submitted 6 months ago by Aiko to c/openwrt@lemdro.id

0 comments fedilink hide all child comments

Hi!

Can anyone please help me to make my MAC be randomly generated after each reboot?

I need some kind of script or instructions. Thanks you!

Found this one:

#!/bin/sh

INSTALL_PATH="/etc/init.d/randomize_mac"

echo "Creating MAC randomizer script..."
cat << 'EOF' > $INSTALL_PATH
#!/bin/sh /etc/rc.common

START=99

start() {
    generate_random_mac() {
        echo $(printf '%02x' $((RANDOM%256)))":"$(printf '%02x' $((RANDOM%256)))":"$(printf '%02x' $((RANDOM%256)))":"$(printf '%02x' $((RANDOM%256)))":"$(printf '%02x' $((RANDOM%256)))":"$(printf '%02x' $((RANDOM%256)))
    }

    change_mac() {
        local iface=$1
        local new_mac=$(generate_random_mac)
        ip link set dev $iface down
        ip link set dev $iface address $new_mac
        ip link set dev $iface up
    }

    for iface in $(ip link show | grep -E '^[0-9]+:' | cut -d ':' -f 2 | cut -d ' ' -f 2); do
        if [ "$iface" != "lo" ]; then
            change_mac $iface
        fi
    done
}
EOF

echo "Making MAC randomizer script executable..."
chmod +x $INSTALL_PATH
echo "Success!"

echo "Enabling MAC randomizer script to run at boot time..."
/etc/init.d/randomize_mac enable
echo "Success!"

echo "Deleting installation script..."
rm -- "$0"

Here is example of output of this command:

echo $(printf '%02x' $((RANDOM%256)))":"$(printf '%02x' $((RANDOM%256)))":"$(printf '%02x' $((RANDOM%256)))":"$(printf '%02x' $((RANDOM%256)))":"$(printf '%02x' $((RANDOM%256)))":"$(printf '%02x' $((RANDOM%256)))

Output:

a7:03:f2:fa:45:5d

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