Kerberos on simple LAN

I’ve been handed the poisoned chalice of setting up Tiger Server on a small LAN behind an ADSL NAT router. It’s not something I usually do and needless to say, I’m struggling. I’d like to get kerberos happening to make logins simple and to be able to host home folders and shared contacts, when I figure out how this is done.

I have a server at home to practice on, which works a treat. I’ve discovered that this seems to be because my ADSL router, a Thomson SpeedTouch, assigns hostnames to connected devices. Tiger server appears to see this as a properly-functioning DNS system and happily starts up kerberos. However, the network I’m referring to is hosted on a DrayTek Vigor 2200, which doesn’t assign hostnames in this way and kerberos won’t start up. And, therefore, from what I’ve read in your books, LDAP isn’t going to work either. So, I have to figure out how to give my server a FQDN.

What’s the simplest way to do this? Needless to say I don’t have control over any external DNS. Should I get an account with DynDNS.org? If so, can I do what I need with a free account?

Any advice (preferably a howto or link to one) would be most gratefully received. According to the publicity, Leopard Server ought to make what I’m trying to do easy. Unfortunately I can’t wait until October. Thanks a lot.