Hello Joe, Thanks for answering my question appropriately. I got the answer am looking for.
Also, thanks for *not suggesting unsolicitedly. * It shows how matured you are. Thanks, Naveen On Wed, 28 Aug 2019, 06:04 Joe Abley, <jab...@hopcount.ca> wrote: > Hi Naveen, > > On 27 Aug 2019, at 20:23, Naveen Kottapalli <naveen.sa...@gmail.com> > wrote: > > > Can one of you tell why would a v4 client send AAAA query or a by client > send a A query when the resolved address cannot be used? > > Sometimes you can't tell if you can use an address until you find out what > it was. You might have some but not all routes for a particular address > family, for example. > > Sometimes you request DNS resource records on behalf of other devices that > have different connectivity from your own. > > Sometimes devices make queries for reasons other than sending datagrams > across a network. > > Sometimes the connectivity a device can have can change, depending on what > network it joins or changing conditions on a network it has already joined. > > A device might have both v4 and v6 connectivity and still use v4 to send a > query with QTYPE=AAAA or v6 to send a query with QTYPE=A. Perhaps the > device knows that the v4 address its using tends to respond quicker than > the v6 address it has tried in the past, or perhaps it's random selection, > or local policy, or something else. > > Bill's answer was pithier, though. > > > Joe >
_______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
