isolation between VM's

From:	"John Lewis" <john at bea dot com dot au>
To:	<m0n0wall at lists dot m0n0 dot ch>
Subject:	isolation between VM's
Date:	Mon, 21 Mar 2005 17:19:33 +0800

What effective level of isolation is there between VM's ? 

Ie. If Mono is installed, then many VM's using either NAT or bridge
mode, and I install malicious software on one VM, will this allow them
access to other VM's ? 

Chrooting does not seem to be of help here, so do you need a message box
to popup showing you traffic that is moving between VM's ?