Reverse DNS: Difference between revisions

 

We have two main ways to solve this, and you can select which you prefer using the control pages. In both cases the task is to set up the name servers which you manage and which will give the answers for reverse DNS queries. The two Reverse DNS name server boxes on the control pages let you specify one or two name servers (by name, not by IP address) for you name server(s). Don't put a dot on the end of the name though.

 

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.

Auto reverse is a third option that works by filling in a PTR record for each IP4 address and a corresponding forward A record as well so that all of your IP addresses will have a valid reverse entry automatically. This is mainly for customers who are not interested in setting up any reverse entries but need something in place to avoid problems with some servers. If you also use A+reverse records in a domain then your IPs will have two PTR records, both valid.