|Is there any way to hide one of these machines on the network while keeping both up and running. |
Not on the same segment there isn't. You cannot, and I repeat, cannot have two identical IP's up and running simultaneously on the same network segment..........period, end of story.
I'm confess I'm curious about your setup.
I suspect you have a second as a backup in case the first fails. If that's the case, I have to wonder why you don't just make the second server a redundant DC. If you did, then the first server could fail and the secondary one would take over without any loss of connectivity. If your plan is to use this second server as a backup in case the first one fails, you still end up with downtime between when number 1 fails and when you can bring #2 up.
Which is why I figure you're in here asking what you're asking.
Do please explain if I'm guessing wrong here....I really am curious....and, if you give some detail on requirements/needs it's just possible someone here may be able to help you.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.