One IP for x.net, x.com, x.org and DNS configuration

[Michael Slade]

I have a DNS request for an organization that has x.net, x.com and x.org
that needs to be routed to a single IP number. All three domains are
appropriately registered.

I have set up a standard zone, etc. for x.com and the appropriate
in-addr.arpa PTR record.

My question is what to do for  x.net and x.org.

Clearly zones for x.net and x.org needed to be created with standard master
and slave NS records.

But what should I do for A records? Should these be CNAME records aliased to
x.com instead? My thought is that this would then be consistent with the
single PTR record pointing back to x.com.

If instead of CNAME records in the zone for the addresses of x.org and
x.net, I used A records that have the same IP, then what do I do about PTR
records, have a PTR record for each domain, ie three PTR records for the
same IP number?

Please confirm that the appropriate CNAME records aliased to x.com is the
correct thing to do!

Michael Slade
mslade1 at rochester.rr.com