Hi Ted, thanks for the comment.
I agree.
Plus one more point.
The ISP hosts the reverse zone.
The ISP also controls any reverse zone to customer assignments, and is
in control of any renumbering.
The ISP may therefore choose to simply wipe any reverse zone content
after renumbering occurs.
That would mitigate any re-use or privacy concerns.
Otherwise the HNA may no longer have authority over the content after a
flash renumbering (e.g. if the ISP is simply authenticating customers
based on source address of the updates)
regards,
Ted Lemon wrote on 05/05/2021 18:42:
On May 5, 2021, at 11:44 AM, Michael Richardson <[email protected]
<mailto:[email protected]>> wrote:
The end user might suffer slightly by having locally served
reverse names that are no longer connected: they should obsolete that
zone
when they realize that their PD hasn't been renewed, until such time,
(if it was a flash renumber), they would be right to think that they
legitimately control them.
In practice I don’t think this is an issue. The reverse lookup is
usually triggered by receipt of a message from an IP address, so as
long as the IP address is still in use internally, the presence of the
reverse zone is wanted. When the address changes, the old zone becomes
obsolete whether it continues to be served or not. The likelihood of
the zone being re-allocated to some other network for which the
original network will then do a reverse lookup is very small, so I
don’t think there’s any reason to be concerned about this.
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regards,
RayH
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