I use a virtual server (several similar cases) set up and registered by someone else. Its IP is
10.0.0.1 and name
a.example.com (both handled by the "someone else" above).
I manage the domain
sub.example.com and would like to also register this server as
There are two ways of doing this in my DNS: either
b IN CNAME a.example.com.
b IN A 10.0.0.1
Since the IP is not distributed by DHCP (it is therefore hardcoded in the server config) there will be a problem in either case if it changes without me knowing and neither solution above would help. The
PTR will point to
a.example.com (I do not control the IP reverse mapping)
So what is the proper way (= canonical / best practice) to do the registration on my side?
b is also referenced in the
NS I will have to go for the second solution. Please see my answer below for details.
I accepted MadHatter's answer because even though it does not address the best practices / standards for the case above (before the
NS update which forces a solution anyway) it gives interesting insights. Thanks!