connecting with rsa key

Hello, I would like to connect an internal computer, on my personal network, to an external one on the web through public rsa key. I use my own old config page http://www.dodin.org/wiki/pmwiki.php?n=Doc.GenerateSsh-PassphraseAutenticati... all this works, mostly, but the public key is copied to the external server with name "root@localhost", witch, of course, do not cope well :-(. any clue? is it necessary to make the internal computer visible fgrom the net, how? thanks jdd -- http://dodin.org