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
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 22.214.171.124
mail AAAA 2a01:e34:xxxx:xxxx:xxxx:xxxx:1122:3344
ns A 126.96.36.199
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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