bind9/HISTORY

Summary of functional enhancements from prior major releases of BIND 9:

BIND 9.10.0

	BIND 9.10.0 includes a number of changes from BIND 9.9 and earlier
	releases.  New features include:

	 - DNS Response-rate limiting (DNS RRL), which blunts the
	   impact of reflection and amplification attacks, is always
	   compiled in and no longer requires a compile-time option
	   to enable it.
	 - An experimental "Source Identity Token" (SIT) EDNS option
	   is now available.  Similar to DNS Cookies as invented by
	   Donald Eastlake 3rd, these are designed to enable clients
	   to detect off-path spoofed responses, and to enable servers
	   to detect spoofed-source queries.  Servers can be configured
	   to send smaller responses to clients that have not identified
	   themselves using a SIT option, reducing the effectiveness of
	   amplification attacks.  RRL processing has also been updated;
	   clients proven to be legitimate via SIT are not subject to
	   rate limiting.  Use "configure --enable-sit" to enable this
	   feature in BIND.
	 - A new zone file format, "map", stores zone data in a
	   format that can be mapped directly into memory, allowing
	   significantly faster zone loading.
	 - "delv" (domain entity lookup and validation) is a new tool
	   with dig-like semantics for looking up DNS data and performing
	   internal DNSSEC validation.  This allows easy validation in
	   environments where the resolver may not be trustworthy, and
	   assists with troubleshooting of DNSSEC problems. (NOTE:
	   In previous development releases of BIND 9.10, this utility
	   was called "delve". The spelling has been changed to avoid
	   confusion with the "delve" utility included with the Xapian
	   search engine.)
	 - Improved EDNS(0) processing for better resolver performance
	   and reliability over slow or lossy connections.
	 - A new "configure --with-tuning=large" option tunes certain
	   compiled-in constants and default settings to values better
	   suited to large servers with abundant memory.  This can
	   improve performance on such servers, but will consume more
	   memory and may degrade performance on smaller systems.
	 - Substantial improvement in response-policy zone (RPZ)
	   performance.  Up to 32 response-policy zones can be
	   configured with minimal performance loss.
	 - To improve recursive resolver performance, cache records
	   which are still being requested by clients can now be
	   automatically refreshed from the authoritative server
	   before they expire, reducing or eliminating the time
	   window in which no answer is available in the cache.
	 - New "rpz-client-ip" triggers and drop policies allowing
	   response policies based on the IP address of the client.
	 - ACLs can now be specified based on geographic location
	   using the MaxMind GeoIP databases.  Use "configure
	   --with-geoip" to enable.
	 - Zone data can now be shared between views, allowing
	   multiple views to serve the same zones authoritatively
	   without storing multiple copies in memory.
	 - New XML schema (version 3) for the statistics channel
	   includes many new statistics and uses a flattened XML tree
	   for faster parsing. The older schema is now deprecated.
	 - A new stylesheet, based on the Google Charts API, displays
	   XML statistics in charts and graphs on javascript-enabled
	   browsers.
	 - The statistics channel can now provide data in JSON
	   format as well as XML.
	 - New stats counters track TCP and UDP queries received
	   per zone, and EDNS options received in total.
	 - The internal and export versions of the BIND libraries
	   (libisc, libdns, etc) have been unified so that external
	   library clients can use the same libraries as BIND itself.
	 - A new compile-time option, "configure --enable-native-pkcs11",
	   allows BIND 9 cryptography functions to use the PKCS#11 API
	   natively, so that BIND can drive a cryptographic hardware
	   service module (HSM) directly instead of using a modified
	   OpenSSL as an intermediary. (Note: This feature requires an
	   HSM to have a full implementation of the PKCS#11 API; many
	   current HSMs only have partial implementations. The new
	   "pkcs11-tokens" command can be used to check API completeness.
	   Native PKCS#11 is known to work with the Thales nShield HSM
	   and with SoftHSM version 2 from the Open DNSSEC project.)
	 - The new "max-zone-ttl" option enforces maximum TTLs for
	   zones. This can simplify the process of rolling DNSSEC keys
	   by guaranteeing that cached signatures will have expired
	   within the specified amount of time.
	 - "dig +subnet" sends an EDNS CLIENT-SUBNET option when
	   querying.
	 - "dig +expire" sends an EDNS EXPIRE option when querying.
	   When this option is sent with an SOA query to a server
	   that supports it, it will report the expiry time of
	   a slave zone.
	 - New "dnssec-coverage" tool to check DNSSEC key coverage
	   for a zone and report if a lapse in signing coverage has
	   been inadvertently scheduled.
	 - Signing algorithm flexibility and other improvements
	   for the "rndc" control channel.
	 - "named-checkzone" and "named-compilezone" can now read
	   journal files, allowing them to process dynamic zones.
	 - Multiple DLZ databases can now be configured.  Individual
	   zones can be configured to be served from a specific DLZ
	   database.  DLZ databases now serve zones of type "master"
	   and "redirect".
	 - "rndc zonestatus" reports information about a specified zone.
	 - "named" now listens on IPv6 as well as IPv4 interfaces
	   by default.
	 - "named" now preserves the capitalization of names
	   when responding to queries: for instance, a query for
	   "example.com" may be answered with "example.COM" if the
	   name was configured that way in the zone file.  Some
	   clients have a bug causing them to depend on the older
	   behavior, in which the case of the answer always matched
	   the case of the query, rather than the case of the name
	   configured in the DNS.  Such clients can now be specified
	   in the new "no-case-compress" ACL; this will restore the
	   older behavior of "named" for those clients only.
	 - new "dnssec-importkey" command allows the use of offline
	   DNSSEC keys with automatic DNSKEY management.
	 - New "named-rrchecker" tool to verify the syntactic
	   correctness of individual resource records.
	 - When re-signing a zone, the new "dnssec-signzone -Q" option
	   drops signatures from keys that are still published but are
	   no longer active.
	 - "named-checkconf -px" will print the contents of configuration
	   files with the shared secrets obscured, making it easier to
	   share configuration (e.g. when submitting a bug report)
	   without revealing private information.
	 - "rndc scan" causes named to re-scan network interfaces for
	   changes in local addresses.
	 - On operating systems with support for routing sockets,
	   network interfaces are re-scanned automatically whenever
	   they change.
	 - "tsig-keygen" is now available as an alternate command
	   name to use for "ddns-confgen".

BIND 9.9.0

	BIND 9.9.0 includes a number of changes from BIND 9.8 and earlier
	releases.  New features include:

	- Inline signing, allowing automatic DNSSEC signing of
	  master zones without modification of the zonefile, or
	  "bump in the wire" signing in slaves.
	- NXDOMAIN redirection.
	- New 'rndc flushtree' command clears all data under a given
	  name from the DNS cache.
	- New 'rndc sync' command dumps pending changes in a dynamic
	  zone to disk without a freeze/thaw cycle.
	- New 'rndc signing' command displays or clears signing status
	  records in 'auto-dnssec' zones.
	- NSEC3 parameters for 'auto-dnssec' zones can now be set prior
	  to signing, eliminating the need to initially sign with NSEC.
	- Startup time improvements on large authoritative servers.
	- Slave zones are now saved in raw format by default.
	- Several improvements to response policy zones (RPZ).
	- Improved hardware scalability by using multiple threads
	  to listen for queries and using finer-grained client locking
	- The 'also-notify' option now takes the same syntax as
	  'masters', so it can used named masterlists and TSIG keys.
	- 'dnssec-signzone -D' writes an output file containing only DNSSEC
	  data, which can be included by the primary zone file.
	- 'dnssec-signzone -R' forces removal of signatures that are
	  not expired but were created by a key which no longer exists.
	- 'dnssec-signzone -X' allows a separate expiration date to
	  be specified for DNSKEY signatures from other signatures.
	- New '-L' option to dnssec-keygen, dnssec-settime, and
	  dnssec-keyfromlabel sets the default TTL for the key.
	- dnssec-dsfromkey now supports reading from standard input,
	  to make it easier to convert DNSKEY to DS.
	- RFC 1918 reverse zones have been added to the empty-zones
	  table per RFC 6303.
	- Dynamic updates can now optionally set the zone's SOA serial
	  number to the current UNIX time.
	- DLZ modules can now retrieve the source IP address of
	  the querying client.
	- 'request-ixfr' option can now be set at the per-zone level.
	- 'dig +rrcomments' turns on comments about DNSKEY records,
	  indicating their key ID, algorithm and function
	- Simplified nsupdate syntax and added readline support

BIND 9.8.0

        BIND 9.8.0 includes a number of changes from BIND 9.7 and earlier
        releases.  New features include:

        - Built-in trust anchor for the root zone, which can be
          switched on via "dnssec-validation auto;"
        - Support for DNS64.
        - Support for response policy zones (RPZ).
        - Support for writable DLZ zones.
        - Improved ease of configuration of GSS/TSIG for
          interoperability with Active Directory
        - Support for GOST signing algorithm for DNSSEC.
        - Removed RTT Banding from server selection algorithm.
        - New "static-stub" zone type.
        - Allow configuration of resolver timeouts via
          "resolver-query-timeout" option.
        - The DLZ "dlopen" driver is now built by default.
        - Added a new include file with function typedefs
          for the DLZ "dlopen" driver.
        - Made "--with-gssapi" default.
        - More verbose error reporting from DLZ LDAP.

BIND 9.7.0

	BIND 9.7.0 includes a number of changes from BIND 9.6 and earlier
	releases.  Most are intended to simplify DNSSEC configuration.
	New features include:

	- Fully automatic signing of zones by "named".
	- Simplified configuration of DNSSEC Lookaside Validation (DLV).
	- Simplified configuration of Dynamic DNS, using the "ddns-confgen"
	  command line tool or the "local" update-policy option.  (As a side
	  effect, this also makes it easier to configure automatic zone
	  re-signing.)
	- New named option "attach-cache" that allows multiple views to
	  share a single cache.
	- DNS rebinding attack prevention.
	- New default values for dnssec-keygen parameters.
	- Support for RFC 5011 automated trust anchor maintenance
	- Smart signing: simplified tools for zone signing and key
	  maintenance.
	- The "statistics-channels" option is now available on Windows.
	- A new DNSSEC-aware libdns API for use by non-BIND9 applications
	- On some platforms, named and other binaries can now print out
	  a stack backtrace on assertion failure, to aid in debugging.
	- A "tools only" installation mode on Windows, which only installs
	  dig, host, nslookup and nsupdate.
	- Improved PKCS#11 support, including Keyper support and explicit
	  OpenSSL engine selection.

BIND 9.6.0

        Full NSEC3 support

        Automatic zone re-signing

	New update-policy methods tcp-self and 6to4-self

        The BIND 8 resolver library, libbind, has been removed from the
        BIND 9 distribution and is now available as a separate download.

	Change the default pid file location from /var/run to
	/var/run/{named,lwresd} for improved chroot/setuid support.

BIND 9.5.0

	GSS-TSIG support (RFC 3645).

	DHCID support.

	Experimental http server and statistics support for named via xml.

	More detailed statistics counters including those supported in BIND 8.

	Faster ACL processing.

	Use Doxygen to generate internal documentation.

        Efficient LRU cache-cleaning mechanism.

        NSID support.

BIND 9.4.0

	Implemented "additional section caching (or acache)", an
	internal cache framework for additional section content to
	improve response performance.  Several configuration options
	were provided to control the behavior.

	New notify type 'master-only'.  Enable notify for master
	zones only.

	Accept 'notify-source' style syntax for query-source.

	rndc now allows addresses to be set in the server clauses.

	New option "allow-query-cache".  This lets "allow-query"
	be used to specify the default zone access level rather
	than having to have every zone override the global value.
	"allow-query-cache" can be set at both the options and view
	levels.  If "allow-query-cache" is not set then "allow-recursion"
	is used if set, otherwise "allow-query" is used if set
	unless "recursion no;" is set in which case "none;" is used,
	otherwise the default (localhost; localnets;) is used.

	rndc: the source address can now be specified.

	ixfr-from-differences now takes master and slave in addition
	to yes and no at the options and view levels.

	Allow the journal's name to be changed via named.conf.

	'rndc notify zone [class [view]]' resend the NOTIFY messages
	for the specified zone.

	'dig +trace' now randomly selects the next servers to try.
	Report if there is a bad delegation.

	Improve check-names error messages.

	Make public the function to read a key file, dst_key_read_public().

	dig now returns the byte count for axfr/ixfr.
			
	allow-update is now settable at the options / view level.

	named-checkconf now checks the logging configuration.

	host now can turn on memory debugging flags with '-m'.

	Don't send notify messages to self.

	Perform sanity checks on NS records which refer to 'in zone' names.

	New zone option "notify-delay".  Specify a minimum delay
	between sets of NOTIFY messages.

	Extend adjusting TTL warning messages.

	Named and named-checkzone can now both check for non-terminal
	wildcard records.

	"rndc freeze/thaw" now freezes/thaws all zones.

	named-checkconf now check acls to verify that they only
	refer to existing acls.

	The server syntax has been extended to support a range of
	servers.

	Report differences between hints and real NS rrset and
	associated address records.

	Preserve the case of domain names in rdata during zone
	transfers.

	Restructured the data locking framework using architecture
	dependent atomic operations (when available), improving
	response performance on multi-processor machines significantly.
	x86, x86_64, alpha, powerpc, and mips are currently supported.

	UNIX domain controls are now supported.

	Add support for additional zone file formats for improving
	loading performance.  The masterfile-format option in
	named.conf can be used to specify a non-default format.  A
	separate command named-compilezone was provided to generate
	zone files in the new format.  Additionally, the -I and -O
	options for dnssec-signzone specify the input and output
	formats.

	dnssec-signzone can now randomize signature end times
	(dnssec-signzone -j jitter).

	Add support for CH A record.

	Add additional zone data constancy checks.  named-checkzone
	has extended checking of NS, MX and SRV record and the hosts
	they reference.  named has extended post zone load checks.
	New zone options: check-mx and integrity-check.


	edns-udp-size can now be overridden on a per server basis.

	dig can now specify the EDNS version when making a query.

	Added framework for handling multiple EDNS versions.

	Additional memory debugging support to track size and mctx
	arguments.

	Detect duplicates of UDP queries we are recursing on and
	drop them.  New stats category "duplicates".

	"USE INTERNAL MALLOC" is now runtime selectable.

	The lame cache is now done on a <qname,qclass,qtype> basis
	as some servers only appear to be lame for certain query
	types.

	Limit the number of recursive clients that can be waiting
	for a single query (<qname,qtype,qclass>) to resolve.  New
	options clients-per-query and max-clients-per-query.

	dig: report the number of extra bytes still left in the
	packet after processing all the records.

	Support for IPSECKEY rdata type.

	Raise the UDP recieve buffer size to 32k if it is less than 32k.

	x86 and x86_64 now have seperate atomic locking implementations.

	named-checkconf now validates update-policy entries.

	Attempt to make the amount of work performed in a iteration
	self tuning.  The covers nodes clean from the cache per
	iteration, nodes written to disk when rewriting a master
	file and nodes destroyed per iteration when destroying a
	zone or a cache.

	ISC string copy API.

	Automatic empty zone creation for D.F.IP6.ARPA and friends.
	Note: RFC 1918 zones are not yet covered by this but are
	likely to be in a future release.

	New options: empty-server, empty-contact, empty-zones-enable
	and disable-empty-zone.

	dig now has a '-q queryname' and '+showsearch' options.

	host/nslookup now continue (default)/fail on SERVFAIL.

	dig now warns if 'RA' is not set in the answer when 'RD'
	was set in the query.  host/nslookup skip servers that fail
	to set 'RA' when 'RD' is set unless a server is explicitly
	set.

	Integrate contibuted DLZ code into named.

	Integrate contibuted IDN code from JPNIC.

	libbind: corresponds to that from BIND 8.4.7.

BIND 9.3.0

	DNSSEC is now DS based (RFC 3658).
	See also RFC 3845, doc/draft/draft-ietf-dnsext-dnssec-*.

	DNSSEC lookaside validation.

	check-names is now implemented.
	rrset-order in more complete.

	IPv4/IPv6 transition support, dual-stack-servers.

	IXFR deltas can now be generated when loading master files,
	ixfr-from-differences.

	It is now possible to specify the size of a journal, max-journal-size.

	It is now possible to define a named set of master servers to be
	used in masters clause, masters.

	The advertised EDNS UDP size can now be set, edns-udp-size.

	allow-v6-synthesis has been obsoleted.

	NOTE:
	* Zones containing MD and MF will now be rejected.
	* dig, nslookup name. now report "Not Implemented" as
	  NOTIMP rather than NOTIMPL.  This will have impact on scripts
	  that are looking for NOTIMPL.

	libbind: corresponds to that from BIND 8.4.5.

BIND 9.2.0

	The size of the cache can now be limited using the
        "max-cache-size" option.

	The server can now automatically convert RFC1886-style recursive
	lookup requests into RFC2874-style lookups, when enabled using the
	new option "allow-v6-synthesis".  This allows stub resolvers that
	support AAAA records but not A6 record chains or binary labels to
	perform lookups in domains that make use of these IPv6 DNS
	features.

	Performance has been improved.

	The man pages now use the more portable "man" macros rather than
	the "mandoc" macros, and are installed by "make install".

	The named.conf parser has been completely rewritten.  It now
	supports "include" directives in more places such as inside "view"
	statements, and it no longer has any reserved words.

	The "rndc status" command is now implemented.

	rndc can now be configured automatically.

	A BIND 8 compatible stub resolver library is now included in
	lib/bind.

	OpenSSL has been removed from the distribution.  This means that to
	use DNSSEC, OpenSSL must be installed and the --with-openssl option
	must be supplied to configure.  This does not apply to the use of
	TSIG, which does not require OpenSSL.

	The source distribution now builds on Windows.  See
	win32utils/readme1.txt and win32utils/win32-build.txt for details.

	This distribution also includes a new lightweight stub
	resolver library and associated resolver daemon that fully
	support forward and reverse lookups of both IPv4 and IPv6
	addresses.  This library is considered experimental and
	is not a complete replacement for the BIND 8 resolver library.
	Applications that use the BIND 8 res_* functions to perform
	DNS lookups or dynamic updates still need to be linked against
	the BIND 8 libraries.  For DNS lookups, they can also use the
	new "getrrsetbyname()" API.

	BIND 9.2 is capable of acting as an authoritative server
	for DNSSEC secured zones.  This functionality is believed to
	be stable and complete except for lacking support for
	verifications involving wildcard records in secure zones.

	When acting as a caching server, BIND 9.2 can be configured
	to perform DNSSEC secure resolution on behalf of its clients.
	This part of the DNSSEC implementation is still considered
	experimental.  For detailed information about the state of the
	DNSSEC implementation, see the file doc/misc/dnssec.

	There are a few known bugs:

	    On some systems, IPv6 and IPv4 sockets interact in
	    unexpected ways.  For details, see doc/misc/ipv6.
	    To reduce the impact of these problems, the server
	    no longer listens for requests on IPv6 addresses
	    by default.  If you need to accept DNS queries over
	    IPv6, you must specify "listen-on-v6 { any; };"
	    in the named.conf options statement.

	    FreeBSD prior to 4.2 (and 4.2 if running as non-root)
	    and OpenBSD prior to 2.8 log messages like
	    "fcntl(8, F_SETFL, 4): Inappropriate ioctl for device".
	    This is due to a bug in "/dev/random" and impacts the
	    server's DNSSEC support.

	    OS X 10.1.4 (Darwin 5.4), OS X 10.1.5 (Darwin 5.5) and
	    OS X 10.2 (Darwin 6.0) reports errors like
	    "fcntl(3, F_SETFL, 4): Operation not supported by device".
	    This is due to a bug in "/dev/random" and impacts the
	    server's DNSSEC support.

	    --with-libtool does not work on AIX.

	A bug in some versions of the Microsoft DNS server can cause zone
        transfers from a BIND 9 server to a W2K server to fail.  For details,
	see the "Zone Transfers" section in doc/misc/migration.