Problem with using same dsa hostkeys on 2 different machines, one of which is backup

From: Kapil (kapiltj_at_yahoo.com)
Date: 03/26/04 

Date: 25 Mar 2004 20:47:01 -0800

Hi,

I generate the host dsa key pair on one computer. Then I copy the
public and private keys to another computer which is to serve as a
backup to this one. So it will have the same ip address and domain
name if the active one goes down.
When I connect to the active from a client computer, it gives no error
since the host keys are known.

Now after rebooting the active, the backup takes over. Now when trying
to ssh to it I get the unknown host key error. When removing the known
host key and trying again the client box gets the new public key which
is very different than what is stored on the backup computer (which is
essentially the same as the one on active). Could some one please let
me know why this is happening?
How is the client getting a different key? Can it even know it is a
different hardware that it is talking to?

Thanks!
Kapil
P.S. Please try and cc me.

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