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Reverse DNS: Difference between revisions
→2. A+Reverse or AAAA+Reverse on a Domain We Host: Added a fuller explanation of non-AA-hosted domains. Added a clueless how-to
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==2. A+Reverse or AAAA+Reverse 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]]
==3. Reverse lookup if your domain hosted elsewhere
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. 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.
==4. Defining a reverse lookup entry on our control systems
For example suppose you have an address from us such as <code>198.51.100.10</code> and you wish to define a PTR (reverse lookup) link to <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 <code>"fred-workstation"</code> into the first edit box for the hostname. 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 to select "ipv6 reverse".
You can also amend existing records or delete them by first clicking on one entry in the list of records below so that it becomes highlighted. You can then either alter the details of the record and then click '''Apply''', or you can click an ‘Erase’ button on the right.
==3. in-addr.arpa or ip6.arpa Zone==
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