Perfect Server Bind zone on dynamic ip
 

I have followed the Howto of "The Perfect Server - Ubuntu 12.04 LTS (Apache2, BIND, Dovecot, ISPConfig 3)" but I am behind a router with a dynamic ip address. I use No-IP Plus in order to solve the problem of a dynamic ip. However, I am now confused as to how I am supposed to setup my DNS Zone in Bind 9.

More to the point, for my situation, how should I handle NS1 and NS2?

Edit:

I see this got a few hits with no replies so I'll post the answer for those who don't know.

ns1.yourdomain.com
ns2.yourdomain.com

I just didn't take it literally with the example given in the book.