+Version 1.6.4 (2018-03-22)
+ o Basic VRF support
+ o Simplified autoconf scripts
+ o BGP: Shutdown communication (RFC 8203)
+ o BGP: Allow exchanging LOCAL_PREF with eBGP peers
+ o BGP: Allow to specify interface for regular sessions
+ o BGP: New option 'disable after cease'
+ o RAdv: Support for more specific routes (RFC 4191)
+ o RAdv: Proper handling of prefix retraction
+ o Filter: Allow silent filter execution
+ o Filter: Fixed stack overflow in BGP mask expressions.
+ o Several bug fixes
+
+Version 1.6.3 (2016-12-21)
+ o Large BGP communities
+ o BFD authentication (MD5, SHA1)
+ o SHA1 and SHA2 authentication for RIP and OSPF
+ o Improved documentation
+ o Several bug fixes
+
+Version 1.6.2 (2016-09-29)
+ o Fixes serious bug introduced in the previous version
+
+Version 1.6.1 (2016-09-22)
+ o Support for IPv6 ECMP
+ o Better handling of IPv6 tentative addresses
+ o Several updates and fixes in Babel protocol
+ o Filter: New !~ operator
+ o Filter: ASN ranges in bgpmask
+ o KRT: New kernel protocol option 'metric'
+ o KRT: New route attribute 'krt_scope'
+ o Improved BIRD help messages
+ o Fixes memory leak in BGP multipath
+ o Fixes handling of empty path segments in BGP AS_PATH
+ o Several bug fixes
+
+Version 1.6.0 (2016-04-29)
+ o Major RIP protocol redesign
+ o New Babel routing protocol
+ o BGP multipath support
+ o KRT: Add support for plenty of kernel route metrics
+ o KRT: Allow more than 256 routing tables
+ o Static: Allow to specify attributes for static routes
+ o Static: Support for BFD controlled static routes
+ o FreeBSD: Setup password for BGP MD5 authentication
+ o IO: Remove socket number limit
+ o Plenty of bug fixes
+
+ Upgrade notes:
+
+ For RIP, most protocol options were moved to interface blocks.
+
+
+Version 1.5.0 (2015-04-20)
+ o Major OSPF protocol redesign.
+ o OSPFv2 multi-instance extension (RFC 6549).
+ o BGP AS-wide unique router ID (RFC 6286).
+ o BGP enhanced route refresh (RFC 7313).
+ o Link state support in BGP.
+ o Latency tracking and internal watchdog.
+ o Uses high port range for BFD on BSD.
+ o Increase max symbol length to 64.
+ o Allows to define unnamed protocols from templates.
+ o Fixes two serious bugs in BGP.
+ o Several bugfixes and minor improvements.
+ o Several minor option changes:
+ - OSPF: Protocol-wide 'instance id' option added.
+ - BGP: Parameters to option 'neighbor' extended.
+ - BGP: Separate option 'interface' added.
+ - BGP: Option 'start delay time' renamed to 'connect delay time'.
+ - BGP: Option 'route limit' deprecated.
+
+ Upgrade notes:
+
+ For OSPF, there are deep internal changes, but user-visible changes
+ are limited to log messages and minor changes in formatting of command
+ output.
+
+ For BGP, version 1.5.0 is essentially a minor release. There are two
+ deprecated options ('start delay time' and 'route limit') and some
+ minor formatting changes.
+
+
+Version 1.4.5 (2014-10-06)
+ o New 'show route noexport' command option.
+ o Port option for BGP sessions.
+ o Better constant handling in set literals.
+ o Better rate filtering of log messages.
+ o Several minor bugfixes.
+
+Version 1.4.4 (2014-07-09)
+ o Extended OSPF multipath support.
+ o Default router preference for RAdv.
+ o Significant changes in socket layer.
+ o Important bugfix in BGP.
+ o Several minor bugfixes.
+
+Version 1.4.3 (2014-04-14)
+ o Important bugfix in IPv6 BGP.
+
+Version 1.4.2 (2014-04-02)
+ o Important bugfix in BFD.
+
+Version 1.4.1 (2014-03-31)
+ o BGP add-path support (RFC draft).
+ o BGP graceful restart (RFC 4724).
+ o OSPF: many changes in socket layer.
+ o OSPF: support for secondary addresses in BSD.
+ o OSPF: names for vlink pseudointerfaces (vlinkX).
+ o Several bugfixes.
+
+Version 1.4.0 (2013-11-25)
+ o BFD protocol (RFC 5880).
+ o BFD support for OSPF and BGP.
+ o New 'allow local as' option for BGP.
+ o Filters allows setting gw, ifname and ifindex.
+ o Filter operator 'delete/filter' extended to bgp_paths.
+ o Filter operator 'len' extended to [e]clists.
+ o BIRD client now allows shorthands for noninteractive commands.
+ o Flag -P for PID file support.
+ o Flag -f added to force BIRD to run in foreground.
+ o Protocol export/import/receive limits are checked during reconfiguration.
+ o Several bugfixes and minor improvements.
+ o Several minor but incompatible changes:
+ - IBGP is multihop by default.
+ - Changes primary address selection on BSD to the first one.
+ - Integers in filters are handled as unsigned.
+ - ISO 8601 time formats used by default.
+ - Import of device routes from kernel protocol allowed.
+ - Last state change now tracks just protocol state change.
+ - Minor changes to default router ID calculation.
+
+Version 1.3.11 (2013-07-27)
+ o OSPF stub router option (RFC 3137).
+ o TTL security for OSPF and RIP.
+ o Protocol packet priority and traffic class handling.
+ o Multiple routing tables support for FreeBSD and OpenBSD.
+ o Extends constants to all filter data types.
+ o Implements eval command.
+ o 'bgppath ~ int set' filter operation.
+ o Several bugfixes.
+
+Version 1.3.10 (2013-04-30)
+ o Lightweight BIRD client for embedded environments.
+ o Dynamic IPv6 router advertisements.
+ o New 'next hop keep' option for BGP.
+ o Smart default routing table for 'show route export/preexport/protocol'.
+ o Automatic router ID selection could be configured to use address of loopback.
+ o Allows configured global addresses of NBMA neighbors in OSPFv3.
+ o Allows BIRD commands from UNIX shell even in restricted mode.
+ o Route limits inherited from templates can be disabled.
+ o Symbol names enclosed by apostrophes can contain dots.
+ o Several bugfixes.
+
+Version 1.3.9 (2013-01-11)
+ o BIRD can be configured to keep and show filtered routes.
+ o Separate receive and import limits.
+ o Several new reconfiguration cmd options (undo, timeout, check).
+ o Configurable automatic router ID selection.
+ o Dragonfly BSD support.
+ o Fixed OSPFv3 vlinks.
+ o Several minor bugfixes.
+
+Version 1.3.8 (2012-08-07)
+ o Generalized import and export route limits.
+ o RDNSS and DNSSL support for RAdv.
+ o Include in config file support wildcards.
+ o History deduplication in BIRD client.
+ o New route attributes krt_source, krt_metric.
+ o Different instance ID support for OSPFv3.
+ o Real broadcast mode for OSPFv2.
+ o Several minor bugfixes.
+
+Version 1.3.7 (2012-03-22)
+ o Route Origin Authorization basics.
+ o RIPng working again.
+ o Extended clist operations in filters.
+ o Fixes several bugs in BSD iface handling.
+ o Several minor bugfixes and enhancements.
+
+Version 1.3.6 (2012-01-20)
+ o Important bugfix in BGP.
+
+Version 1.3.5 (2012-01-10)
+ o Protocol templates.
+ o Deterministic MED option for BGP.
+ o Support for link-local addresses in BGP and static protocols.
+ o Several bugfixes.
+
+Version 1.3.4 (2011-10-10)
+ o Static recursive routes.
+ o Several bugfixes.
+
+Version 1.3.3 (2011-09-11)
+ o OSPF NSSA.
+ o BGP extended communities.
+ o BGP TTL security.
+ o Configuration option "include" added (based on patch from Alexander V. Chernikov).
+ o Some minor bugfixes.
+
+Version 1.3.2 (2011-07-08)
+ o Allows run with restricted privileges.
+ o Community list filter operation.
+ o Fixes several problems in filter syntax:
+ - Fixes several conflicts in the grammar.
+ - Fixes a bug in (a..b, c) pair patterns.
+ - Makes pair patterns orthogonal.
+ - Allows term expressions in pair patterns without additional ( ).
+ - Allows several comma separated values in switch cases.
+ o Many bugfixes.
+
+Version 1.3.1 (2011-05-02)
+ o Added Linux kernel route attributes krt_prefsrc and krt_realm.
+ o Added BGP option 'med metric' related to MED handling.
+ o Allows to use constants from /etc/iproute2/rt_* files.
+ o Several bugfixes.
+
+Version 1.3.0 (2011-03-31)
+ o Proper iBGP (can be used with IGP).
+ o Multipath support (OSPF and static).
+ o L2 link state detection.
+ o IPv6 router advertisements.
+ o Much improved OSPF reconfiguration.
+ o Point-to-MultiPoint interfaces (OSPF).
+ o Minor changes and improvements in config file grammar.
+ o Better community list matching.
+ o Changes default behavior of BGP IPv6 socket to v6only.
+ Use 'listen bgp dual' for the old behavior.
+ o Changes default for handling missing link-local addresses on
+ route servers. Use 'missing lladdr drop' for the old behavior.
+ o Important bugfix for OSPF.
+ o Several minor bugfixes.
+
+Version 1.2.5 (2010-10-10)
+ o Several mostly minor bugfixes.
+
+Version 1.2.4 (2010-08-03)
+ o Added 'show memory' command.
+ o Important bugfix in IPv6 BGP.
+ o Several minor bugfixes.
+
+Version 1.2.3 (2010-06-01)
+ o Pattern matching for community lists.
+ o Many fixes in OSPF protocol (esp. in multi-areas and vlinks).
+ o Several minor bugfixes.
+
+Version 1.2.2 (2010-04-10)
+ o Much better BSD kernel support (IPv6, alien routes, ...).
+ o Deep OSPF socket changes, fixes OSPFv2/v3 behavior on BSD.
+ o OSPFv2 in Linux now supports more non-stub IP prefixes
+ on one physical iface.
+ o Export of device routes to the kernel is more restricted.
+ o Routes with strange scope not allowed in BIRD routing tables.
+ o New filterable route attributes bgp_originator_id,
+ bgp_cluster_list and ospf_router_id.
+ o Restricted read-only CLI (option -r).
+ o Pattern matching for 'show protocols' command.
+ o BGP protocol details in 'show protocols all' command.
+ o Configurable syslog name (and default on IPv6 changed).
+ o Statistic counters for pipes were fixed.
+ o Many bugfixes in BGP, OSPF, filters, ...
+
+Version 1.2.1 (2010-02-11)
+ o Option 'interpret communities' allows to override implicit handling
+ of well-known communities.
+ o 'configure' command uses route reload when filters change.
+ o Adds router ID of advertising router as OSPF route attribute.
+ o 'show route' command indicates primary route and shows OSPF Router ID.
+ o Configurable date/time formats.
+ o Symbol names can be enclosed by '' and so include hyphen and start with number.
+ o Several minor bugfixes.
+
+Version 1.2.0 (2010-01-05)
+ o Implements OSPFv3 (IPv6 support for OSPF). Because the code is
+ shared with OSPFv2 and there were deep changes in it, we suggest
+ caution during upgrade to OSPF users. Some advanced features
+ (like NSSA, vlinks and authentication) are not yet implemented.
+ o Implements MRTdump - binary logging protocol compatible with other
+ routing daemons. Only BGP part of MRTdump is yet implemented.
+ o Changes default value of BGP attribute LOCAL_PREF from 0 to 100.
+ Use 'default bgp_local_pref 0' BGP protocol option for the old
+ behavior. The new value is suggested by RFC 4277.
+ o Changes default mode of pipes from opaque to transparent.
+ Use 'mode opaque' protocol option if the old behavior is needed.
+ Opaque pipe mode is deprecated and might be removed in the future.
+
+Version 1.1.7 (2009-12-20)
+ o Implements BGP Route Refresh (RFC 2918).
+ o Implements route reload command.
+ o Deep changes and bugfixes in pipe protocol.
+ o Bugfix in OSPF premature aging of LSA.
+ o Bugfix in OSPF next hop calculation.
+ o Bugfix in core related to route withdraws.
+ o Several minor bugfixes.
+
+Version 1.1.6 (2009-11-19)
+ o Implements RFC 5004 - prefer older external routes.
+ o There is a change how route servers handle missing IPv6 link
+ local addresses in next hop atribute - see 'missing lladdr'
+ option.
+ o Several minor features (description field, parse check option).
+ o Several minor bugfixes.
+
+Version 1.1.5 (2009-10-29)
+ o Better scalability of BGP.
+ o New accessors for AS path - first and last.
+ o Allows to set protocol-specific router ID.
+ o Allows import kernel 'onlink' routes.
+ o Endianity check in buildsystem changed.
+
+Version 1.1.4 (2009-10-02)
+ o BGP passive option.
+ o Several minor bugfixes.
+
+Version 1.1.3 (2009-09-11)
+ o Bugfix in core
+ o Bugfix in BGP related to AS2->AS4 conversion.
+
+Version 1.1.2 (2009-08-23)
+ o Allow more kernel routing tables in IPv6.
+ o Bugfix in core
+
+Version 1.1.1 (2009-08-14)
+ o 'more' style paging in BIRD client.
+ o Important core bug fixed.
+ o Portability to non-x86 related bugfixes.
+ o As usual, miscellaneous bugfixes.
+
+Version 1.1.0 (2009-06-28)
+ o Parametrized pair and path mask expressions in the filter language.