NSD was first conceived to allow for more genetic diversity for DNS server implementations used by the root-server system and it has been developed for operations in environments where speed, reliability, stability, and security are of high importance. NSD is in use by several top-level domain registries and on root servers such as k.root-servers.net.What\'s New in This Release: [ read full changelog ]Features:· AXFR/TCP fallback in case of failing IXFR zone transfers.· RFC 4635: support for hmac-sha1 and hmac-sha256 TSIG algorithm identifiers, \"Bugfix #130\".· Configure the source ip-address for notifies (master) and zone requests (slave) in nsd.conf, \"Bugfix #148\".· nsd-notify and nsd-xfer allow you to configure the outgoing hostname and source port, in addition to the source address.· Additional debug and verbose log messages.Bugfixes:· Only normalize dnames in rdatas when rrtype is listed in RFC 4034, section 6.2: Canonical RR Form, following draft-ietf-dnsext-dnssec-bis-updates (affects RRSIG and NSEC records).· Typo in zonec manpage.· Bugfix in log_finalize.· Fix race condition between nsdc patch and server reload.Operational notes:· IMPORTANT: Format of ixfr.db has changed. When you are planning an upgrade to the new NSD release, make sure to process the old ixfr.db before starting the new release (by running nsdc patch).· IXFR is transmitted over TCP by default instead of UDP. If you want to continue the use of IXFR/UDP, please modify your zone configuration file to: request-xfr: UDP 1.2.3.4 tsigkey· We strongly recommend to enable TSIG if you send IXFR over UDP. When all masters fail to transmit IXFR/UDP, slave will fallback to IXFR/TCP and eventually AXFR/TCP.· nsd-patch prints errors to stderr instead of stdout.