Preventing NM from managing one of my interfaces?

[Joe Emenaker <joe emenaker com>]

I've got a laptop with which I use two wireless adapters. With one of 
them, I'd like NetworkManager to manage and automatically connect me to 
wireless networks when they're available. The other, I want 
NetworkManager to leave alone, letting me hack on it with iwconfig and 
whatnot.

I've googled, but I can't figure out how to get NetworkManager to leave 
the second interface alone. The pages I've read say that all you need to 
do is mention the interface in /etc/network/interfaces, but I've done 
that, and NetworkManager still takes over management of it. Maybe the 
directives I'm using (like "auto wlan1") in the interfaces file are ones 
that NetworkManager ignores.

In fact, the NM Wiki says that, if I put
>  [ifupdown]
>  managed=false
in /etc/NetworkManager/nm-system-settings.conf, then NM will leave alone 
anything mentioned in /etc/network/interfaces... but I've *got* that in 
the conf file, and NM is still grabbing and managing/associating both 
wlan0 and wlan1.

Any ideas?

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