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Martin
Asked: 2018-11-17 06:47:14 +0800 CST

rDNS -- more than one IP per server?

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Very simple question that I can't find a reliable answer to, with Google -- can my server be the reverse DNS for multiple IP addresses?

Is it bad practise / wrong / asking for trouble to say my server sub.hostname.co.uk is the rDNS for:

118.168.10.100

and

118.168.11.200

NOTE: These IP addresses are in different subnets (.10. and .11. )

This Q&A seems to imply it would cause awkwardness. To clarify further, the second IP is a secondary IP, if that changes the requirement criteria.

Each Site on the server will be associated primarily with one of the two IPs.

?? Thanks!

reverse-dns

1 Answers

  1. Best Answer

    I would say it depends. If we look at how rDNS works there is no problem. The resolver asks for example 78.67.45.123.in-addr.arpa and gets a PTR record with the name you defined.

    The problem I could think of is with any reputation system that checks reverse addresses and forward addresses and how the correlate, like for SMTP. They might get confused by this.

    An idea to get around this would be some kind of generic address that is used as forward and reverse address and a "descriptive" address like:

    (generic)
host1.network1.domain.tld -> IP1
host2.network1.domain.tld -> IP2

(descriptive)
awesomeproduct.domain.tld -> IP1,IP2
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