DNS reply ADDITIONAL SECTION data with MX lookup ?
Mark.Andrews at nominum.com
Thu Jun 22 16:26:43 UTC 2000
> quoting Brad Knowles:
> > Hmm. So, if one of the A RRs for a name has a lower TTL and then
> > gets aged out, all the other A RRs for that same name get thrown away
> > at the same time? Interesting.
> it's slightly different. See ttlcheck() and rrsetupdate() in ns_resp.c [8.2.2
Actually what Brad said is correct. Named discards the whole RRset
when any RR expires.
ttlcheck is used to workout if we will accept a particular RRset or
not based on TTL consistancy.
We don't normalise differing ttls except on loading a master zone.
I am aware that this is not strict RFC 2181. However we also
consider any case where a RRset is not all discarded at the same
time to be a bug.
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at nominum.com
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