kerberos setup question

[upef]

I want to run a KDC and client software on a single standalone linux box 
(no network connections). I just want to run the gss-client and 
gss-server programs. How can I do this? The krb5kdc daemon wont start 
unless I am connected to my ISP, and then it tries to listen on a socket 
on the ISP assigned IP address. If I disconnect, the kdc won't start.
System: Red Hat Linux 9.0

Thanks in advance.