On Wed, 13 Nov 2013, Mark Andrews wrote:
Apart from being messy, it does not work if you want to query and
remember NS records (in case you have to switch from forwarding mode
to being a full recursor)
Garbage. There is absolutely nothing stopping you remembering NS
records returned in the responses above. If you have to switch the
NS records will be in the A response or not be available at all.
Yes you can ask for the NS records, and the NS records that are in
a completely different zone, at the expense of launching new queries,
adding round trips.
It doesn't fail when a CNAME or a DNAME is involved. The data is
useful to validate the CNAME/DNAME and you just initiate more
queries to validate the target of the CNAME/DNAME.a
Yes, more round trips. The idea one to do it in ONE round trip.
If the chain gets longer, I guess you are also increasing the effects
of packet loss, as every single query has to return successfully.
Which is why you do it over TCP and let the transport layer handle
the retransmissions.
Exactly. Over tcp using query-chain :)
Paul
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