how to allow domain.com as well as www.domain.com ?

[Brett_Frankenberger at NOTES.UP.COM]

>hostname.domain.com.    IN   A    <IP Address>
>www.domain.com.     IN  CNAME  hostname.domain.com.
>domain.com.         IN  CNAME <IP address> (as suggested below)

Two problems with this:

(1) CNAME's point to other domain names, not to IP Addresses, so the CNAME
should be:
domain.com.         IN  CNAME hostname.domain.com
But ...

(2) You can't have a CNAME on a zone name, because (except for the DNSSEC
stuff) a CNAME requires that the CNAME be the only record for a domain
name, and a zone name also needs a SOA record.  In other words, you can't
have:
   XXXXXXX IN CNAME YYYYYYY
and
   XXXXXXX IN <anything else (except some DNSSEC stuff)>
But in you case, you need the "anything else" because you have to have a
   domain.com IN SOA ,..
record,

So to get what you want, you'll need to either use an A record on
domain.com

domain.com    IN A <IP Address>