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Reverse DNS: Difference between revisions
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<code>1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa</code>
==2. A+Reverse or AAAA+Reverse DNS records on a Domain We Host ==
Where you have a domain that we manage in our DNS, and want an IP we manage to refer to and from that name. To do this you can create an A+reverse record or an AAAA+Reverse in your domain DNS entries (instead of simply an A or AAAA record). This will automatically complete the corresponding reverse entry in our DNS mapping the IP address back to the name.This is usually the simplest way to handle reverse DNS when you also have a domain with us.
[[File:Reverse-dns-a-reverse.png|border]]
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If you administer a domain that is not hosted with us, then '''we''' can add an entry into our control system specifying your choice of domain name (optionally including subdomains) specifically to then allow you to set up entries on our systems that will define a number of individual reverse lookup mappings from your AAISP addresses to individual names below your ‘base’ domain name. There is no charge for this, '''however it must be requested'''; this can be confusing as you will not find the relevant configuration to which this section refers will not be visible until requested.
An example is given in the next section. On our systems you will define a number of records, one (or more) per address of yours, and we append your chosen domain name to each to form a reverse lookup (PTR) record that we define and publish for you. You can ask for several of your domain names to be set up on our systems. Such a domain name can include your choice of subdomain in your request.
===How to:===
For example, suppose you have an IP address from us such as <code>198.51.100.10</code> and you wish to define a PTR mapping (reverse lookup) to the name <code>fred-workstation.your-domain.example.com</code>.Important: If this domain is not hosted by us, you must first have asked staff to set up <code>your-domain.example.com</code> in our control system, but you only need to do so once. Then you would go into our control panel system, go to ''"Domains"'' and select the entry <code>your-domain.example.com</code> which we will have added for you following your request. Now for each individual reverse lookup entry you wish to define, enter for example the name <code>"fred-workstation"</code> into the first edit box. The value is not restricted to be just one single DNS label; it could contain dots for subdomains. Then enter the IP address in the edit box below, in this case <code>198.51.100.10</code>. You must remember to then click '''OK''' or '''Apply''' to create the record. You will see that a new record is now listed below.
Notice there is an option to select "ipv4 reverse" or "ipv6 reverse" lookup - IPv4 is correct in this example case. The procedure for IPv6 address reverse lookups is the same, just click the pop-out menu and select "ipv6 reverse".
==3. in-addr.arpa or ip6.arpa Zone==
[[File:Reverse-dns-inaddrarpa.png|border]]
=b. Delegating reverse DNS to your own nameservers=
We have two main ways of setting up the delegation of reverse DNS to your own nameservers, and you can select which you prefer using the control pages. In both cases the task is to set a reference on our system to the name servers that you manage and that will give the answers for reverse DNS queries. The reverse DNS name server boxes on the control pages let you specify one to six name servers (by name, not by IP address) for your name server(s). Don't put a dot on the end of the name though.
[[File:Reverse-dns-delegation.png|none|frame|Delegating reverse DNS to your own nameservers. Enter your DNS hostnames in to the boxes, not IP addresses]]
This setting is found on the control pages under the link to your Login. This will apply to IPv4 and [[IPv6]].
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