This is a useful setting to configure for anyone, but it is essential for customers running an outgoing mail server on their Cloud Server.
This article shows how to add a reverse DNS record (also known as an RDNS record and a PTR record) to map your server’s IP address to a domain name (for example, 126.96.36.199. Perform the following steps the create a reverse DNS record in the Cloud Control Panel: ©2017 Rackspace US, Inc.
By default, Samba creates the following two forward zones during provisioning/upgrading (of course with your own domain name): The Samba internal DNS is a new implementation.
Although BIND is a grown up DNS and long in production on millions of servers, the Samba BIND DLZ module is still new.
When pinging a website or IP address, one part of the output is the server’s RDNS record.
When you enter a domain name into your browser, the DNS system will find the IP address of the server the domain is associated with. It establishes what domain is associated with the IP address.
The process of acquiring reverse resolution is accomplished using PTR records that are rooted in the domain.
The goal of my latest batch file is to set up DNS on each system.
We put “unauthenticated” in quotes because having a Reverse DNS record attached to your domain does not automatically guarantee acceptance of email originating from your domain by the recipient’s email server.
It’s just that non-matching or generic reverse DNS lookup settings are often rejected out of hand.
If you're running Samba as Active Directory Domain Controller, you also have to administer a DNS server.
You will already find general information on the internal DNS and the BIND DLZ module and documentation about Bind as DNS Backend in the Wiki.