Viktor Dukhovni <ietf-d...@dukhovni.org> wrote: > > Except in the presence of CNAME (possibly via DNAME) records, which > might mean that the client needs more records to validate multiple > nodes in the DNS tree. > > So without nameserver assistance 1RTT via parallelism is not always > possible.
Yes, with aliases you sometimes need 2RTT. However edns-chain-query also has a problem with aliases since the server doesn't know what the client might already have cached regarding the CNAME or DNAME target. The server has to either send too little information, in which case the client needs a second round trip, or too much information, in which case it negates the bandwidth saving. Tony. -- f.anthony.n.finch <d...@dotat.at> http://dotat.at/ Irish Sea: Southwesterly 6 to gale 8, but 4 or 5 at first in north. Moderate or rough. Rain or drizzle, squally showers later. Moderate or good, occasionally poor. _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
