Paul Vixie <[email protected]> wrote: > > if you mean label boundaries you have to say label boundaries, > because dots can appear inside labels.
Yes. > second, you can't send a burst of queries, as a validator. even apart > from the fact that any CNAME (RFC 2317 style) can add delegation points > that weren't at label boundaries in your original QNAME, and there can > be more than one of these, so you're not at RTT=1 or even RTT<=2, you're > at RTT>0 without knowing the upper bound... You get the entire CNAME chain in the first RTT so you can validate all the links in the chain in the second RTT. > ...you can't flood the channel. In most cases this will be four or six concurrent queries which is hardly flooding the channel. This is comparable to the TCP initial window or the burst of SYNs you get when a browser starts fetching a page full of images. Browsers send a lot of concurrent queries. My experience with adns tells me that concurrent queries work nicely at volumes orders of magnitude bigger than we are considering here. If you already have a TCP channel open you can send all the queries with one write and they'll happily fit in a single segment. Tony. -- f.anthony.n.finch <[email protected]> http://dotat.at/ Shannon, South Rockall: Southwesterly 7 to severe gale 9, increasing storm 10, perhaps violent storm 11 later. Very rough or high, becoming high or very high later. Rain or thundery showers. Moderate or poor, occasionally good. _______________________________________________ DNSOP mailing list [email protected] https://www.ietf.org/mailman/listinfo/dnsop
