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Version 2.0.1 (2018-01-16)
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  o Linux MPLS kernel support
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  o Better handling of channels inherited from templates
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  o Default EBGP Route Propagation Behavior without Policies (RFC 8212)
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  o Many bugfixes
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  Notes:
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  To satisfy requirements of RFC 8212, external BGP protocols now require
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  explicit configuration of import and export policies.
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Version 2.0.0 (2017-12-11)
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  o Integrated IPv4 + IPv6 design
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  o Support for MPLS next hops
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  o Support for VPNv4 and VPNv6 networks
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  o Microsecond timers infrastructure
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  o Basic VRF support
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  o Babel: Support for dual-stack IPv4/IPv6
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  o Babel: Many improvements and bugfixes
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  o Major BGP protocol redesign
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  o Full support for Multiprotocol BGP
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  o BGP multicast support (SAFI 2)
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  o BGP flowspec support (RFC 5575)
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  o BGP with MPLS labels (RFC 3107)
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  o BGP MPLS/VPN support (RFC 4364)
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  o BGP 6PE - IPv6 NLRI over IPv4 MPLS (RFC 4798)
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  o BGP IPv4 NLRI with an IPv6 Next Hop (RFC 5549)
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  o BGP Confederations (RFC 5065)
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  o BGP Shutdown communication (RFC 8203)
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  o BGP: Allow exchanging LOCAL_PREF with eBGP peers
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  o BGP: Allow to specify interface for regular sessions
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  o OSPF: Support of address families in OSPFv3
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  o OSPF: Enable ECMP and Link detection by default
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  o RAdv: Support for more specific routes (RFC 4191)
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  o RAdv: Proper handling of prefix retraction
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  o RIP: Enable ECMP and Link detection by default
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  o Redesign of RPKI handling
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  o New RPKI-Router protocol
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  o Static: Minor overhaul
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  o Static: Support for all new route types
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  o Kenrel: Default Linux kernel metric changed to 32
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  o Kernel: Fix IPv6 ECMP handling with Linux 4.11+
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  o Update of show route command
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  o BIRD client persistent history
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  o New build system
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  o Unit tests
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  o ...
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  Notes:
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  Tables are now defined with appropriate net type keyword. Protocols and tables
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  are now connected by explicit channels, most related protocol options (table,
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  import, export, ...) are now channel options. See doc/bird.conf.example2 for
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  configuration examples. Some options were removed/replaced.
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Version 1.6.3 (2016-12-21)
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  o Large BGP communities
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  o BFD authentication (MD5, SHA1)
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  o SHA1 and SHA2 authentication for RIP and OSPF
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  o Improved documentation
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  o Several bug fixes
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Version 1.6.2 (2016-09-29)
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  o Fixes serious bug introduced in the previous version
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Version 1.6.1 (2016-09-22)
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  o Support for IPv6 ECMP
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  o Better handling of IPv6 tentative addresses
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  o Several updates and fixes in Babel protocol
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  o Filter: New !~ operator
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  o Filter: ASN ranges in bgpmask
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  o KRT: New kernel protocol option 'metric'
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  o KRT: New route attribute 'krt_scope'
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  o Improved BIRD help messages
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  o Fixes memory leak in BGP multipath
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  o Fixes handling of empty path segments in BGP AS_PATH
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  o Several bug fixes
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Version 1.6.0 (2016-04-29)
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  o Major RIP protocol redesign
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  o New Babel routing protocol
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  o BGP multipath support
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  o KRT: Add support for plenty of kernel route metrics
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  o KRT: Allow more than 256 routing tables
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  o Static: Allow to specify attributes for static routes
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  o Static: Support for BFD controlled static routes
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  o FreeBSD: Setup password for BGP MD5 authentication
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  o IO: Remove socket number limit
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  o Plenty of bug fixes
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  Upgrade notes:
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  For RIP, most protocol options were moved to interface blocks.
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Version 1.5.0 (2015-04-20)
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  o Major OSPF protocol redesign.
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  o OSPFv2 multi-instance extension (RFC 6549).
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  o BGP AS-wide unique router ID (RFC 6286).
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  o BGP enhanced route refresh (RFC 7313).
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  o Link state support in BGP.
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  o Latency tracking and internal watchdog.
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  o Uses high port range for BFD on BSD.
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  o Increase max symbol length to 64.
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  o Allows to define unnamed protocols from templates.
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  o Fixes two serious bugs in BGP.
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  o Several bugfixes and minor improvements.
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  o Several minor option changes:
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     - OSPF: Protocol-wide 'instance id' option added.
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     - BGP: Parameters to option 'neighbor' extended.
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     - BGP: Separate option 'interface' added.
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     - BGP: Option 'start delay time' renamed to 'connect delay time'.
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     - BGP: Option 'route limit' deprecated.
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  Upgrade notes:
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  For OSPF, there are deep internal changes, but user-visible changes
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  are limited to log messages and minor changes in formatting of command
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  output.
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  For BGP, version 1.5.0 is essentially a minor release. There are two
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  deprecated options ('start delay time' and 'route limit') and some
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  minor formatting changes.
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Version 1.4.5 (2014-10-06)
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  o New 'show route noexport' command option.
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  o Port option for BGP sessions.
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  o Better constant handling in set literals.
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  o Better rate filtering of log messages.
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  o Several minor bugfixes.
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Version 1.4.4 (2014-07-09)
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  o Extended OSPF multipath support.
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  o Default router preference for RAdv.
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  o Significant changes in socket layer.
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  o Important bugfix in BGP.
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  o Several minor bugfixes.
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Version 1.4.3 (2014-04-14)
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  o Important bugfix in IPv6 BGP.
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Version 1.4.2 (2014-04-02)
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  o Important bugfix in BFD.
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Version 1.4.1 (2014-03-31)
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  o BGP add-path support (RFC draft).
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  o BGP graceful restart (RFC 4724).
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  o OSPF: many changes in socket layer.
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  o OSPF: support for secondary addresses in BSD.
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  o OSPF: names for vlink pseudointerfaces (vlinkX).
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  o Several bugfixes.
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Version 1.4.0 (2013-11-25)
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  o BFD protocol (RFC 5880).
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  o BFD support for OSPF and BGP.
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  o New 'allow local as' option for BGP.
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  o Filters allows setting gw, ifname and ifindex.
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  o Filter operator 'delete/filter' extended to bgp_paths.
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  o Filter operator 'len' extended to [e]clists.
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  o BIRD client now allows shorthands for noninteractive commands.
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  o Flag -P for PID file support.
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  o Flag -f added to force BIRD to run in foreground.
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  o Protocol export/import/receive limits are checked during reconfiguration.
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  o Several bugfixes and minor improvements.
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  o Several minor but incompatible changes:
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     - IBGP is multihop by default.
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     - Changes primary address selection on BSD to the first one.
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     - Integers in filters are handled as unsigned.
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     - ISO 8601 time formats used by default.
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     - Import of device routes from kernel protocol allowed.
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     - Last state change now tracks just protocol state change.
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     - Minor changes to default router ID calculation.
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Version 1.3.11 (2013-07-27)
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  o OSPF stub router option (RFC 3137).
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  o TTL security for OSPF and RIP.
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  o Protocol packet priority and traffic class handling.
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  o Multiple routing tables support for FreeBSD and OpenBSD.
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  o Extends constants to all filter data types.
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  o Implements eval command.
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  o 'bgppath ~ int set' filter operation.
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  o Several bugfixes.
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Version 1.3.10 (2013-04-30)
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  o Lightweight BIRD client for embedded environments.
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  o Dynamic IPv6 router advertisements.
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  o New 'next hop keep' option for BGP.
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  o Smart default routing table for 'show route export/preexport/protocol'.
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  o Automatic router ID selection could be configured to use address of loopback.
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  o Allows configured global addresses of NBMA neighbors in OSPFv3.
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  o Allows BIRD commands from UNIX shell even in restricted mode.
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  o Route limits inherited from templates can be disabled.
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  o Symbol names enclosed by apostrophes can contain dots.
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  o Several bugfixes.
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Version 1.3.9 (2013-01-11)
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  o BIRD can be configured to keep and show filtered routes.
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  o Separate receive and import limits.
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  o Several new reconfiguration cmd options (undo, timeout, check).
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  o Configurable automatic router ID selection.
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  o Dragonfly BSD support.
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  o Fixed OSPFv3 vlinks.
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  o Several minor bugfixes.
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Version 1.3.8 (2012-08-07)
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  o Generalized import and export route limits.
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  o RDNSS and DNSSL support for RAdv.
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  o Include in config file support wildcards.
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  o History deduplication in BIRD client.
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  o New route attributes krt_source, krt_metric.
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  o Different instance ID support for OSPFv3.
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  o Real broadcast mode for OSPFv2.
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  o Several minor bugfixes.
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Version 1.3.7 (2012-03-22)
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  o Route Origin Authorization basics.
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  o RIPng working again.
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  o Extended clist operations in filters.
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  o Fixes several bugs in BSD iface handling.
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  o Several minor bugfixes and enhancements.
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Version 1.3.6 (2012-01-20)
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  o Important bugfix in BGP.
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Version 1.3.5 (2012-01-10)
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  o Protocol templates.
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  o Deterministic MED option for BGP.
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  o Support for link-local addresses in BGP and static protocols.
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  o Several bugfixes.
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Version 1.3.4 (2011-10-10)
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  o Static recursive routes.
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  o Several bugfixes.
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Version 1.3.3 (2011-09-11)
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  o OSPF NSSA.
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  o BGP extended communities.
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  o BGP TTL security.
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  o Configuration option "include" added (based on patch from Alexander V. Chernikov).
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  o Some minor bugfixes.
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Version 1.3.2 (2011-07-08)
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  o Allows run with restricted privileges.
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  o Community list filter operation.
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  o Fixes several problems in filter syntax:
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     - Fixes several conflicts in the grammar.
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     - Fixes a bug in (a..b, c) pair patterns.
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     - Makes pair patterns orthogonal.
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     - Allows term expressions in pair patterns without additional ( ).
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     - Allows several comma separated values in switch cases.
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  o Many bugfixes.
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Version 1.3.1 (2011-05-02)
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  o Added Linux kernel route attributes krt_prefsrc and krt_realm.
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  o Added BGP option 'med metric' related to MED handling.
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  o Allows to use constants from /etc/iproute2/rt_* files.
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  o Several bugfixes.
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Version 1.3.0 (2011-03-31)
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  o Proper iBGP (can be used with IGP).
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  o Multipath support (OSPF and static).
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  o L2 link state detection.
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  o IPv6 router advertisements.
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  o Much improved OSPF reconfiguration.
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  o Point-to-MultiPoint interfaces (OSPF).
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  o Minor changes and improvements in config file grammar.
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  o Better community list matching.
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  o Changes default behavior of BGP IPv6 socket to v6only.
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    Use 'listen bgp dual' for the old behavior.
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  o Changes default for handling missing link-local addresses on
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    route servers. Use 'missing lladdr drop' for the old behavior.
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  o Important bugfix for OSPF.
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  o Several minor bugfixes.
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Version 1.2.5 (2010-10-10)
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  o Several mostly minor bugfixes.
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Version 1.2.4 (2010-08-03)
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  o Added 'show memory' command.
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  o Important bugfix in IPv6 BGP.
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  o Several minor bugfixes.
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Version 1.2.3 (2010-06-01)
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  o Pattern matching for community lists.
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  o Many fixes in OSPF protocol (esp. in multi-areas and vlinks).
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  o Several minor bugfixes.
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Version 1.2.2 (2010-04-10)
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  o Much better BSD kernel support (IPv6, alien routes, ...).
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  o Deep OSPF socket changes, fixes OSPFv2/v3 behavior on BSD.
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  o OSPFv2 in Linux now supports more non-stub IP prefixes
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    on one physical iface.
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  o Export of device routes to the kernel is more restricted.
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  o Routes with strange scope not allowed in BIRD routing tables.
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  o New filterable route attributes bgp_originator_id,
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    bgp_cluster_list and ospf_router_id.
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  o Restricted read-only CLI (option -r).
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  o Pattern matching for 'show protocols' command.
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  o BGP protocol details in 'show protocols all' command.
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  o Configurable syslog name (and default on IPv6 changed).
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  o Statistic counters for pipes were fixed.
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  o Many bugfixes in BGP, OSPF, filters, ...
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Version 1.2.1 (2010-02-11)
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  o Option 'interpret communities' allows to override implicit handling
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    of well-known communities.
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  o 'configure' command uses route reload when filters change.
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  o Adds router ID of advertising router as OSPF route attribute.
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  o 'show route' command indicates primary route and shows OSPF Router ID.
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  o Configurable date/time formats.
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  o Symbol names can be enclosed by '' and so include hyphen and start with number.
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  o Several minor bugfixes.
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Version 1.2.0 (2010-01-05)
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  o Implements OSPFv3 (IPv6 support for OSPF). Because the code is
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    shared with OSPFv2 and there were deep changes in it, we suggest
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    caution during upgrade to OSPF users. Some advanced features
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    (like NSSA, vlinks and authentication) are not yet implemented.
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  o Implements MRTdump - binary logging protocol compatible with other
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    routing daemons. Only BGP part of MRTdump is yet implemented.
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  o Changes default value of BGP attribute LOCAL_PREF from 0 to 100.
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    Use 'default bgp_local_pref 0' BGP protocol option for the old
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    behavior. The new value is suggested by RFC 4277.
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  o Changes default mode of pipes from opaque to transparent.
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    Use 'mode opaque' protocol option if the old behavior is needed.
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    Opaque pipe mode is deprecated and might be removed in the future.
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Version 1.1.7 (2009-12-20)
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  o Implements BGP Route Refresh (RFC 2918).
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  o Implements route reload command.
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  o Deep changes and bugfixes in pipe protocol.
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  o Bugfix in OSPF premature aging of LSA.
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  o Bugfix in OSPF next hop calculation.
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  o Bugfix in core related to route withdraws.
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  o Several minor bugfixes.
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Version 1.1.6 (2009-11-19)
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  o Implements RFC 5004 - prefer older external routes.
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  o There is a change how route servers handle missing IPv6 link
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    local addresses in next hop atribute - see 'missing lladdr'
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    option.
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  o Several minor features (description field, parse check option).
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  o Several minor bugfixes.
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Version 1.1.5 (2009-10-29)
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  o Better scalability of BGP.
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  o New accessors for AS path - first and last.
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  o Allows to set protocol-specific router ID.
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  o Allows import kernel 'onlink' routes.
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  o Endianity check in buildsystem changed.
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Version 1.1.4 (2009-10-02)
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  o BGP passive option.
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  o Several minor bugfixes.
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Version 1.1.3 (2009-09-11)
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  o Bugfix in core
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  o Bugfix in BGP related to AS2->AS4 conversion.
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Version 1.1.2 (2009-08-23)
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  o Allow more kernel routing tables in IPv6.
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  o Bugfix in core
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Version 1.1.1 (2009-08-14)
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  o 'more' style paging in BIRD client.
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  o Important core bug fixed.
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  o Portability to non-x86 related bugfixes.
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  o As usual, miscellaneous bugfixes.
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Version 1.1.0 (2009-06-28)
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  o Parametrized pair and path mask expressions in the filter language.
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  o Transparent pipe mode allows to implement BGP route server with
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    independent route policy for each peer.
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  o Kernel route table synchronization does not allow overwriting
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    of alien routes.
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  o Configurable BGP import route limits.
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  o During BGP error delay, incoming connections are rejected.
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  o BGP route statistics.
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  o Better support for multiple network addresses on OSPF interfaces.
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  o As usual, miscellaneous bugfixes.
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Version 1.0.15 (2009-05-25)
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  o FreeBSD and NetBSD port renewed. OpenBSD port introduced.
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  o import/preimport 'show route' modifiers was renamed to export/preexport
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    for consistency with filters.
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  o Minor change in the grammar of 'interface' config option.
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  o Many bugfixes in IPv6 BGP.
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  o As usual, miscellaneous bugfixes.
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Version 1.0.14 (2009-04-28)
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  o A lot of bugfixes in BGP, OSPF and core.
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  o A bugfix in filters in the pipe protocol. It is recommended to
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    check whether the new behavior of used pipe filters is consistent
397
    with expectations.
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  o Reimplementation of prefix sets and a slight change in the meaning
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    of some prefix set patterns.
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Version 1.0.13 (2009-03-14)
402
  o A lot of bugfixes in BGP, OSPF and core
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  o A new syntax for BGP masks
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Version 1.0.12 (2008-11-12)
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  o new BGP features: BGP MD5, ASN32, BGP route reflector
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  o BGP bugfixes
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...
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Version 1.0.9 (2004-07-15)
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  o  Minor bugfix in RIP
413
  o  A lot of OSPF code rewritten, OSPF supports multiple areas,
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     virtual links, MD5 authentication. It is fully compatible
415
     with rfc2329.
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Version 1.0.8 (2004-06-07)
418
  o  A lot of bug fixes in RIP, OSPF and BGP (thanx to Andreas Steinmetz)
419
  o  FreeBSD and NetBSD port introduced
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  o  Complete code clean up
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Version 1.0.7 (2003-08-20)
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  o  OSPF bug fixes
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Version 1.0.6 (2003-04-06)
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  o  No more byte order problems in RIP authentication. Thanks to
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     Eric Leblond <eleblond@init-sys.com> for a patch.
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  o  Fixed interoperability problems with Cisco and Zebra when talking
430
     IPv6 BGP.
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  o  Handle more primary addresses with different scopes gracefully.
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     IPv6 needs that.
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  o  Comparison of prefixes in filters doesn't ignore their lengts.
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  o  As usually, OSPF bug fixes.
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  o  Documentation building tools now work with recent linuxdoc-tools.
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Version 1.0.5 (2001-06-09)
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439
  o  Minor cleanups in the libraries.
440
  o  Removed a couple of warnings when compiling with newer glibc.
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  o  OSPF bug fixes.
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Version 1.0.4 (2000-09-04)
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  o  Fixed a serious bug in 1.0.3.
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Version 1.0.3 (2000-09-03)
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449
  o  OSPF works better on NBMA networks. Some configuration tags added.
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Version 1.0.2 (2000-08-24)
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453
  o  Minor bug fixes to OSPF.
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Version 1.0.1 (2000-06-22)
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457
  o  Updated documentation and fixed a couple of bugs.
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Version 1.0.0 (2000-06-09)
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461
  o  First stable release.
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Version 0.0.0 (2000-05-13)
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465
  o  First public development release.