DNS reply ADDITIONAL SECTION data with MX lookup ?

Brad Knowles blk at skynet.be
Thu Jun 22 10:26:01 UTC 2000

At 1:12 PM +0300 2000/6/22, Matti Aarnio wrote:

>    It looks like my initial question about the Additional Records Section
>    of DNS reply got a definite answer, thanks.  "If one gets A's for a
>    machine, aside of delegation glue records those are likely to be
>    full set of A records for that machine.  Having A's doesn't mean one
>    gets AAAAs if such exist for the same machine.  --> To be sure one
>    shall ask explicitely for A's and AAAA's if such haven't been supplied
>    in the ARS."  (This all in the scope of MX processing.)

	Just make sure that you've gotten authoritative answers, because 
if you get an answer out of cache, some RRs may have been aged out at 
a different time, so you could get incomplete information.

	That is, if you really, really care about making sure you've got 
absolute complete information.

   These are my opinions -- not to be taken as official Skynet policy
Brad Knowles, <blk at skynet.be>                || Belgacom Skynet SA/NV
Systems Architect, Mail/News/FTP/Proxy Admin || Rue Colonel Bourg, 124
Phone/Fax: +32-2-706.13.11/12.49             || B-1140 Brussels
http://www.skynet.be                         || Belgium

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