> Olafur Gudmundsson <mailto:o...@ogud.com> > Friday, January 16, 2015 7:51 AM > ... > One of the oldest ideas on that was from Andreas Gustafsson was to wrap > XFR transmission inside compressed transmission.
late BIND4 and early BIND8 had something called ZXFR that did this. it never worked out of the box, but frederico neves in brazil fixed it and had it running in production for his inter-site synchronization some time in the mid/late 1990's. it's worth asking him if it was worthwhile (noting, this was before incompressible DNSSEC signatures were added.) on the topic of this draft, the current IXFR encoding requires transmitting the old RRsets, which in the case of DNSSEC are large. the benefit of this is that it provides extra assurance of synchronization -- if the receiver does not have the old RRsets then we know that IXFR can't work, and AXFR is tried. my proposal at the time IXFR was being worked on back in DNSEXT was to use the UPDATE encoding, which allows RRset deletion or replacement without transmitting the old RRset. i still think that's a good plan, and if... > I have a much more radical zone transfer proposal in the works that is over > persistent TCP > connections and that is ripe for secured and compressed transmission. ...if we were going to do zone synchronization over a persistent TCP session, then i would recommend once again the UPDATE encoding for the individual deltas. -- Paul Vixie
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