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I don't think so. I do know the following - here at my current client there are two distinct domains that I deal with - Irvine and San Jose. My Windows laptop is in the Irvine domain. My home directory is on a filer and is shared between my Windows laptop and the various Linux server machines in Irvine. I generate a key and put it in my ~/.ssh/authorized_keys and I can ssh to localhost or any of the Linux servers. Additionally I can ssh from Linux to my laptop, passwordlessly.Andrew, Keys will "ALWAYS" be different irrespective if it is two servers on same or different domain. That is the whole point of copying keys to remote servers authorized_keys file.
Else one could just "cat" its own key in its own authorized_keys file, right?But one can just "cat" their own key to their own authorized_keys file. That's why permissions on ~/.ssh are of paramount importance to ssh - it needs to make sure that "Tom" didn't go into "Jane"'s ~/.ssh/authorized_keys file and insert themselves.
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