On 06/19/2017 01:05 AM, Reindl Harald wrote:
Am 18.06.2017 um 17:38 schrieb 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
it's nearly always misleading and results in randomness on the
receiving server which name get logged and if A/PTR matches
normally you should always have:
* IP with *one* PTR
* the A-Record for the PTR matches
* smtp_helo_name of your MTA matches the same name
This is clear in IPV4 but what about IPV6 ?
If I declare xxx.com bind :
mail A 123.124.125.126
mail AAAA 2a01:e34:xxxx:xxxx:xxxx:xxxx:1122:3344
ns A 123.124.125.126
ns AAAA 2a01:e34:xxxx:xxxx:xxxx:xxxx:aabb:ccdd
What should I put for IPV4 reverse address : if I put mail.xxx.com, the
reverse address will not point on ns.xxx.com, and if put ns.xxx.com, the
reverse dns will not point on mail.xxx.com, and I shall have mail problem.
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