Re: [dns-privacy] [dhcwg] WGLC started -- draft-ietf-homenet-naming-architecture-dhc-options-12

Ted Lemon <mellon@fugue.com> Wed, 05 May 2021 16:42 UTC

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From: Ted Lemon <mellon@fugue.com>
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Date: Wed, 5 May 2021 12:42:31 -0400
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Cc: "Bernie Volz (volz)" <volz=40cisco.com@dmarc.ietf.org>, "STARK, BARBARA H" <bs7652@att.com>, "homenet@ietf.org" <homenet@ietf.org>, "dhcwg@ietf.org" <dhcwg@ietf.org>, "dns-privacy@ietf.org" <dns-privacy@ietf.org>, "int-area@ietf.org" <int-area@ietf.org>
To: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [dns-privacy] [dhcwg] WGLC started -- draft-ietf-homenet-naming-architecture-dhc-options-12
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On May 5, 2021, at 11:44 AM, Michael Richardson <mcr+ietf@sandelman.ca> 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.