Disabling networkmanager for a specific interface

Question

I'd like to do some experimentation with hostap without disabling my primary wireless interface. How do I tell networkmanager to keep its hands off a specific interface or interfaces while allowing it to continue managing all other interfaces normally? I'm using Ubuntu 9.04.

(Wasn't sure if this should go on superuser or serverfault, as networkmanager isn't much of a 'server' tool - if it belongs on serverfault please feel free to move it)

Edit: I've tried adding this to /etc/network/interfaces:

allow-hotplug wlan2
iface wlan2 inet static
        address 192.168.49.1
        netmask 255.255.255.0

But this has no apparent effect, even after restarting NetworkManager.

Here's my /etc/NetworkManager/nm-system-settings.conf:

[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=false

Edit[2]: Looks like I needed to restart nm-system-settings, then NetworkManager.

Answer 1

To quote /usr/share/doc/network-manager/README.Debian:

Configuration of wireless and ethernet interfaces ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Only devices that are not listed in /etc/network/interfaces or which have been configured "auto" and "dhcp" (with no other options) are managed by NM.

This way you can setup a custom (static) configuration for a device and NM will not try to override this setting.

After modifying /etc/network/interfaces you have to restart NM with the command "/etc/init.d/network-manager restart".

and then it has some examples.

Answer 2

You can also add this line to /etc/network/interfaces

iface wlan0 inet manual