Odd A record in our hosts zone file

[Matus UHLAR - fantomas]

On 25.06.21 18:29, Bruce  Johnson wrote:
>Thank you…this is very useful information; I thought TTL could only be specified on a per-zone basis, not per-host.

not even per-host. Different RR types for the same host can have different
TTL.

>mail            1m      IN      A       xxx.xxx.xxx.52; dhbex1
>mail            1m      IN      A       xxx.xxx.xxx.54; dhbex2

mail		1d	IN	TXT	"v=spf1 a -all"
mail		1h	IN	MX	0	mail

etc.
Only same RR types MUST have same value so e.g.:

mail            1m      IN      A       xxx.xxx.xxx.52; dhbex1
mail            2m      IN      A       xxx.xxx.xxx.54; dhbex2

would be incorrect and server will choose one of those to implement for all
RRs (see rfc 2182 section 5.2)
-- 
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