New to kerberos on Linux, need help on realm etc.

[Gary Hostetler]

I am using a linux server in a Windows 2003 environment and need kerberos
running for some squid authentication. My first question concerns realms. Do
I make the one linux box that I have the realm or do I point to my Active
Directory and use its fully qualified name?

Once I figure this out I will go on to "Cannot contact any kdc for requested
realm while getting..." My time is set within the 5 minutes of the Active
Directory. 

I know these are basic questions but I did not have any luck on the
internet.

Thanks
Gary