I don't understand why the network card needs to be down...
I've run disconnected many times with my network card up and running, and the 
ip stack continues to respond.  

Barring that, how about aliasing your lo interface:
/sbin/ifconfig lo:0 10.4.4.40 netmask 255.255.255.128

Of course use whatever ipaddress and subnetmask fits your needs...

Jon
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