Jump to content

This is the support site for Andrews & Arnold Ltd, a UK Internet provider. Information on these pages is generally for our customers but may be useful to others, enjoy!

Reverse DNS: Difference between revisions

m
clean up, typos fixed: , → , , etc, → etc.,, eg: → e.g.: (2)
m (clean up, typos fixed: , → , , etc, → etc.,, eg: → e.g.: (2))
Most ADSL customers will have a small block of IPs which they can delegate using CNAME if they want. However all ADSL lines also have a single IP address for the external (WAN) side of their [[ADSL Router|ADSL router]]. This is always delegated as a single zone for the IP address.
 
e.g.:
eg:
if you have the IPs 192.0.2.1 and 2001:DB8::1 reverses will be created of:
1.2.0.192.in-addr.arpa
 
==4. Generic Per IP Block==
Support staff can add a name on a per IP block basis and we'll automatically create reverse records, ege.g., if your block is 81.187.81.0/29 and we add the name hosts.testing.me.uk, then we'll create reverse records such as:
0.hosts.testing.me.uk
1.hosts.testing.me.uk
==1. Delegation by NS==
 
Delegation by NS works by putting your name server in our DNS for each of your addresses. e.g. if you had 217.169.0.0-3 then we would put your name servers for each entry 0.0.169.217.in-addr.arpa , 1.0.169.217.in-addr.arpa,2.0.169.217.in-addr.arpa,3.0.169.217.in-addr.arpa . This would mean you can create 4 separate zone files each of which has to normal SOA records, etc., and a single PTR record with the name for that IP address. This is logically the correct way of doing it as the reverse DNS zone is delegated at each level of control right down to the IP address level. It is rather tedious to set up lots of zone files though, especially if you have, say, 128 addresses.
 
Remember that you also have a WAN address which may be completely different from your other addresses, and the reverse DNS is also delegated to your name servers for this too.
editor
698

edits