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Accepted
parsecpython
Asked: 2014-11-23 23:46:28 +0800 CST

How (or is it possible) to run code inside of /etc/network/interfaces?

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The task: generate random mac when an interfaces comes up.

#this does work to generate a random mac
echo '00 60 2f'$(od -An -N3 -t xC /dev/urandom) | sed -e 's/ /:/g'

the inside of /etc/network/interfaces:

auto eth0
iface eth0 inet dhcp
    #This works:
    hw-mac-address aa:bb:cc:dd:ee:ff
    #while this does not when I ifup eth0:
    hw-mac-address $(echo '00 60 2f'$(od -An -N3 -t xC /dev/urandom) | sed -e 's/ /:/g')

Any thoughts or suggestions?

networking

1 Answers

  1. Best Answer

    I found multiple solutions. 1 of them is with pre-up, (Thansk fkraiem)

    This requires that macchanger is installed. /etc/network/interfaces looks like this:

    auto eth0
iface eth0 inet dhcp
pre-up macchanger -m `echo '00 60 2f'$(od -An -N3 -t xC /dev/urandom) | sed -e 's/ /:/g'` $IFACE

    The second solution is the correction of my originally incorrect configuration.
    This solution doesn't require that macchanger is installed

    auto eth0
iface eth0 inet dhcp
hwaddress ether `echo '00 60 2f'$(od -An -N3 -t xC /dev/urandom) | sed -e 's/ /:/g'`
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