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Reverse DNS question
Basically I'm curious about best practices with reverse DNS.
Over the years I would only have the primary server IP configured with reverse DNS, pointing to the server hostname.
But I wonder if it would be best to configure reverse DNS for all of my IPs. I'm in the process of colocating a new server, so figured this would be a good time to sort this all out.
With my new server I have a /29 IP block. 4 IPs will be allocated to the server operating system, 1 IP to the IPMI card and the other 3 IPs for the network, broadcast and gateway.
In that scenario, is it best for me to configure reverse DNS only for the primary server IP?
Should I configure reverse DNS for the 4 IPs allocated to the operating system? All pointing to the server hostname?
Or, should I setup reverse DNS for all 8 IPs? If so, should the PTR record be the server hostname for each of the IPs? Or do they need to be unique hostnames?
Which would be the best way to go about it?
Thanks in advance for any tips & advice regarding this.
What's the point setting rDNS on all your IPs?
Of course it won't hurt but it's kinda useless. Setting rDNS on the IP you host your email should be enough.
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That's sort of the question I'm trying to figure out... whether it's a good idea to setup rDNS on all my IPs or if just for the primary IP of the server, or just server operating system IPs that might host sites with email.
Originally Posted by
All I've ever done previously is to setup rDNS for the primary IP of my server, but not for any other secondary IPs on the server.
Maybe I haven't been doing it the "right way" or "best way" previously, so thought it would be a good idea to get some clarification here.
It's mostly email. rDNS is useful for transit providers or at least the data center to label their stuff, but not so much for individual users.
Originally Posted by
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"Setting rDNS on the IP you host your email should be enough."
that's all we do.
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