static interface shuts down on disconnect

[Simon Bazley <simon bazley themartingale com>]

Hi,

I've got a server which is running several databases and web services, 
which is connected to both public and private networks, via different 
physical network ports.

All of the services communicate with each other using the private IP 
10.0.0.18 which is bound to the static ip address of the private 
connection (on eth1).  This server is self contained, so the private 
connection is purely so that other private computers can also access the 
databases contained on the machine.

However, when I physically unplug the cable from the private network 
eth1 goes down, and looses it's IP address, hence all the services on 
that machine stop being able to communicate with each other.

How do I tell NetworkManager, not to shut down that interface on 
physical disconnect?  It should be up, all the time.  All physical 
interfaces on that machine should be up all the time.

Simon