restricting listener access

Hello,
I'm looking for a way to restrict oracle listener to accept commands from the local machine only, so forbidding remote administration.

I particular I'd like to avoid a situation such:

machine1 (ip1, listener1)
machine2 (ip2, net8 installed).

ip1 != ip2

On machine one is configured a listener.ora with listener1 entry
(pointing to ip1).

When issued:

lsnrctl stop

on machine2 the listener is indeed stopped but on machine1.

Is there a way to stop such events?
Password and firewall are not good options... :(

(By the way: it was tested on 8.1.7.x databases. I don't know if it is
still valid for 9i and 10g: I'm trying soon).

-- 

Fabrizio Magni

fabrizio.magni_at_mycontinent.com

replace mycontinent with europe