localhost hostname problem

[Paul]

I'm having a devil of a time: running FC2 through eth0 RCA modem on
comcast.net.  That connection did something, now instead of being
localhost at login, I'm x1-6-04-4f-00 or something like that, which
happens to be the hw addy of the eth0.  How do I change this, or at
least nickname it, to get back to localhost?  I'm a newbie wanting to
learn! :)  Thanks.

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