Linux – Change interface mac (hw) address using udev rules

linuxudev

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

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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Linux udev persistent net rule

I'm using Slackware 10 as a reference, so there may be a slight variation in configuration files.

/etc/rc.d/rc.inet1 is the init script for the network interface, which is where I would begin for customizing any start time network configuration.

It looks like this init script does not have any logic for specifying the hardware address. However, a simple modification should be able to enable this functionality.

As far as your specific question, I think you're asking if specifying NIC1 as eth1 in udev will result in NIC0 defaulting to eth0? If so: probably, but I'd recommend testing this. Otherwise, please clarify.

Linux – How to write rules for persistent net names

To answer your specific question, add this to persistent-net.rules:

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="AA:AA:AA:AA:AA:AA", ATTR{dev_id}=="0x0", ATTR{type}=="1", NAME="eth0"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="BB:BB:BB:BB:BB:BB", ATTR{dev_id}=="0x0", ATTR{type}=="1", NAME="eth0"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="CC:CC:CC:CC:CC:CC", ATTR{dev_id}=="0x0", ATTR{type}=="1", NAME="eth1"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="DD:DD:DD:DD:DD:DD", ATTR{dev_id}=="0x0", ATTR{type}=="1", NAME="eth1"

Leave persistent-net-generator.rules alone. udev will not overwrite the rules you added manually but the generator rules will cause new rules to be added for new cards as usual.

Best Answer

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Linux udev persistent net rule

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