Multiple A and PTR and the "main" ones?

[Reindl Harald]

Am 14.09.2015 um 07:31 schrieb Harshith Mulky:
> I could not stop asking the question related to this.
>
> I am sorry if this is not relevant to this Topic
>
> Is it not possible to send multiple "A"  Records for a same name with
> different IPs. It might be that the bind might be listening on multiple
> IPs on same server
> What would happen if one of the IP interfaces is not reachable?

the same as when it is a different machine, the client which chose that 
record will fail to connect, dns round-robin is for load-sharing and not 
failover

>  > ----------------------------------------------------------------------
>  >
>  > Message: 1
>  > Date: Fri, 11 Sep 2015 15:48:32 +0200
>  > From: Matus UHLAR - fantomas <uhlar at fantomas.sk>
>  > To: bind-users at lists.isc.org
>  > Subject: Re: Multiple A and PTR and the "main" ones?
>  > Message-ID: <20150911134832.GC24000 at fantomas.sk>
>  > Content-Type: text/plain; charset=us-ascii; format=flowed
>  >
>  > >>On 09/11/2015 02:10 PM, Reindl Harald wrote:
>  > >>>just don't specifiy more than one PTR for a IP
>  >
>  > >Am 11.09.2015 um 14:14 schrieb Marek Kozlowski:
>  > >>Specifying multiple CNAMEs for the same alias is not possible
>  >
>  > On 11.09.15 14:22, Reindl Harald wrote:
>  > >no idea what that means, a CNAME can point to anotehr CNAME in circles
>  >
>  > that's true, however not recomended.
>  > It's also possible to have multiple CNAMEs pointing to the same record,
>  > which I would recommend.
>  >
>  > >>defining more than one PTR for the same IP is possible I believe there
>  > >>is some reason for it.
>  >
>  > >>I think sometimes I might be useful. Is it a bad practice?
>  > >
>  > >it is a bad practice and leads exactly to the problems you describe
>  > >when the other side tries to verify A/PTR matching because there is
>  > >just no ordering like there is also no rodering having multiple A
>  > >records for the same name with different IP's

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