Manual IP configuration and DNS utils on Ubuntu and prgrm

(1) Manual ip address configuration on ubuntu

My new ip address is the following.
$host xxx.new.xen.prgmr.com has address NNN.NNN.NNN.NNN

/etc/network/interfaces has been modified to update with the above.

(2) Install dns utilities
The dig and other dns utilities has been installed by the following command line.
sudo apt-get install dnsutils

(3) Remap my own domain to a new global ip address
Two of A records, @ and www, have been updated with the new addresses.

Reference on CNAME
http://www.zytrax.com/books/dns/ch8/cname.html