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Konrads
Asked: 2016-11-10 04:32:43 +0800 CST

Change interface mac (hw) address using udev rules

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I want to set a specific ethernet MAC address for an interface using UDEV rules. I have the following rule: SUBSYSTEM=="net", ACTION=="add", ATTRS{serial}=="50B123", ATTR{address}="00:22:33:44:55:AA", NAME="yolo0"

The rule matches and the interface is renamed to "yolo0" however the hw ether address remains unchanged from the one pre-set by the manufacturer. I can change the mac address manually of course using:

ifconfig yolo0 hw ether ..00:22:33:44:55:AA

linux udev

2 Answers

  1. Best Answer

    You can use udev PROGRAM rules for that, by making the appropriate call to ip link set … address …. Like this:

    /etc/udev/rules.d/10-network-persistent-custom-mac-address.rules

    SUBSYSTEM=="net", ACTION=="add", ATTRS{serial}=="50B123", PROGRAM="/sbin/ip link set %k address 00:22:33:44:55:AA"
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  2. IMHO udev is the wrong place to do that, the rule is for setting the interface name.

    There are two things to consider when you add a network card:

    1. The name with which you'll refer to that interface

    2. The network properties you'll give to an interface with a given name, the name you chosen in point 1.

    This said, you can set your MAC address, IP, subnet, autoneg et cetera when you setup / bring up your network interface, for example, on RH /SuSE you can do this for (let's say) eth0 in:

    /etc/sysconfig/network-scripts/ifcfg-eth0

    For RedHat add in there:

    MACADDR=YOUR_DESIRED_MAC_ADDRESS

    For SuSE:

    LLADDR=YOUR_DESIRED_MAC_ADDRESS

    And you're good to go.

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