When doing embedded network development, its typical that you have the embedded device you work on connected to one network interface (eth1) while you are simultaneously connected to your corporate or home LAN and the internet via another interface (eth0 or wlan0).

The thing about embedded development is that you spend a lot of time rebooting the embedded device with new firmware which sends your PC’s network interface down and up which triggers a new DHCP request on that interface, which then proceeds to time out (often there is no DHCP server on the embedded device) before you have to manually assign the same static IP that you were using on the interface a few seconds before.

As it turns out there is a way to tell NetworkManager to keep its mitts off of a particular interface. Firstly, find the udi of the interface with the ‘lshal’ command. eg:

udi = ‘/org/freedesktop/Hal/devices/net_00_05_1b_ac_6c_03’
info.capabilities = {‘net’, ‘net.80203’, ‘wake_on_lan’} (string list)
info.category = ‘net.80203’ (string)
info.interfaces = {‘org.freedesktop.Hal.Device.WakeOnLan’} (string list)
info.parent = ‘/org/freedesktop/Hal/devices/usb_device_7a6_8515_0001_if0’ (string)
info.product = ‘Networking Interface’ (string)
info.subsystem = ‘net’ (string)
info.udi = ‘/org/freedesktop/Hal/devices/net_00_05_1b_ac_6c_03’ (string)
linux.hotplug_type = 2 (0x2) (int)
linux.subsystem = ‘net’ (string)
linux.sysfs_path = ‘/sys/devices/pci0000:00/0000:00:1d.7/usb7/7-1/7-1.6/7-1.6:1.0/net/eth1’ (string)
net.80203.mac_address = 21939121155 (0x51bac6c03) (uint64)
net.address = ‘00:05:1b:ac:6c:03’ (string)
net.arp_proto_hw_id = 1 (0x1) (int)
net.interface = ‘eth1’ (string)
net.linux.ifindex = 5 (0x5) (int)
net.originating_device = ‘/org/freedesktop/Hal/devices/usb_device_7a6_8515_0001_if0’ (string)
org.freedesktop.Hal.Device.WakeOnLan.method_argnames = {”, ”, ‘enable’} (string list)
org.freedesktop.Hal.Device.WakeOnLan.method_execpaths = {‘hal-system-wol-supported’, ‘hal-system-wol-enabled’, ‘hal-system-wol-enable’} (string list)
org.freedesktop.Hal.Device.WakeOnLan.method_names = {‘GetSupported’, ‘GetEnabled’, ‘SetEnabled’} (string list)
org.freedesktop.Hal.Device.WakeOnLan.method_signatures = {”, ”, ‘b’} (string list)

Then add this udi as an un-managed device to the [keyfile] section of ‘/etc/NetworkManager/nm-system-settings.conf’. eg:


It should take effect immediately, and you shouldn’t even need to restart NetworkManager.

Note: Thanks to tambeti on #opensuse-gnome for the tip.