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Re: Should a nameserver know about itself?

"D. J. Bernstein" <djb@cr.yp.to> Thu, 31 May 2001 06:41 UTC

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From: "D. J. Bernstein" <djb@cr.yp.to>
To: dnsop@cafax.se
Subject: Re: Should a nameserver know about itself?
References: <3065.991226662@brandenburg.cs.mu.OZ.AU> <Pine.BSF.4.21.0105310930110.58053-100000@julubu.staff.apnic.net>
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Bruce Campbell writes:
> Nameserver IPs collected at time of request, onus on
> client/requestor to ensure that they are kept up to date.

Yes, that's how delegations work. RFC 1034: ``The administrators of both
zones should insure [sic] that the NS and glue RRs which mark both sides
of the cut are consistent _and remain so_.'' (Emphasis added.)

As for the frequency of changes: Yes, you have to be notified whenever
the server's IP address changes. On the other hand, you're already
dealing with changes in the NS names. Sensibly chosen in-zone NS names
(a.ns, b.ns) have the advantage of lasting forever. The overall effect
on the frequency of changes could be positive or negative.

---Dan

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