reverse dns configuration for IPV4, IPV6+ dns+ mail ?

[Matus UHLAR - fantomas]

On 18.06.17 16:26, Mark Elkins wrote:
>Put two reverse records in both  the IPv4 and IPv6 reverse zones....
>
>in the "125.124.123.in-addr.arpa" zone:
>
>126   IN   PTR   mail.xxx.com.
>126   IN   PTR   ns.xxx.com.

while this is possible, it's not always a good idea.
One reverse record is enough in most cases you need reverse DNS.
(which mostly means, for outgoing mail)

>Nothing wrong with a machine (or interface on a machine) having more
>than one name for the same address. List them all in the reverse
>configuration. After all, a NS record usually has at least two records ;-)

there are cases when having two reverse records is misleading.

-- 
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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