CHANGES

babel 0.95 (unreleased)

  * We now send retractions after a redistributed route is retracted.
  * Fixed a bug that could cause reliable messages (retractions and
    router-id switches) to only be sent twice.
  * We no longer obey a silent time at startup, instead sending a bunch of
    retractions.  The silent time is inconvenient, but seldom useful.
  * Updates for routes to self are now sent together with other updates
    (they used to be sent more frequently).
  * Fixes the configuration parser to interpret hello-interval as a number
    of seconds, as specified in the documentation (it used to be interpreted
    as a number of milliseconds).
  * INCOMPATIBLE CHANGE: the update interval is now a per-interface value,
    and defaults to 5 times the hello interval.  The -u flag is gone.

10 April 2009: babel 0.94

  * Fixed a bug introduced in 0.17 that caused recently retracted routes to
    remain until the routing table entry was flushed.
  * Implemented per-interface configuration of parameters such as link
    cost, hello interval etc.  The command-line flags are now only used to
    set defaults.

15 March 2009: babel 0.93

  * No longer update seqno periodically, rely on explicit seqno requests.

21 January 2009: babel 0.92

  * Fixed a bug that could cause a crash if an interface was repeatedly
    brought down and then back up.
  * Implemented some protection against time stepping when POSIX clocks are
    not available.

10 November 2008: babel 0.91

  * Maintain buffered updates per-interface, which makes multi-interface
    nodes significantly less noisy.
  * Changed the strategy for dealing with unfeasible routes to be slightly
    more generous while still avoiding loops.
  * Fixed a bug that would cause multi-hop requests to be spuriously resent.
  * Made a number of micro-optimisations throughout.

23 October 2008: babel 0.90

  * INCOMPATIBLE CHANGE: all new Babel version 2 protocol, which is both
    more robust and less chatty than version 1.
  * Tweaked the strategies for sending triggered updates and unfeasible
    requests to be more conservative.
  * Minor optimisations all over the place.
  * Removed the protocol specification -- the version 2 spec is maintained
    separately.

18 October 2008: babel 0.17

  * INCOMPATIBLE CHANGE: removed support for ``inherit'' in redistribution.
  * INCOMPATIBLE CHANGE: a pidfile is now created by default.
  * Increased the default seqno interval.
  * Use a fixed kernel priority for routes installed by babel.

29 September 2008: babel 0.16

  * Tweaked cost computation to be slightly slower.
  * Implemented a local interface for GUIs.
  * INCOMPATIBLE CHANGE: the -X command-line option is no more.

8 July 2008: babel 0.15

  * Fixed a bug that could break link-quality estimation on yo-yo links.
  * Protect against duplicate neighbour ids on the same interface.
  * More tweaks to improve scaling with the number of kernel routes.
  * Tweaked the default update interval.

1 July 2008: babel 0.14

  * Use POSIX clocks if available to protect against clock stepping.
  * Made babel use available internal routes straight away when the
    set of redistributed routes changes.
  * Lifted the arbitrary limit on the number of kernel routes.
  * Changed the routing metric used on wireless links to plain ETX.
  * Bridges are now automatically detected and treated as potential
    wireless interfaces.
  * Reduced the default hello interval.

24 May 2008: babel 0.13

  * Removed all arbitrary limits (interfaces, neighbours, routes,
    xroutes and sources).
  * Fixed a bug that prevented expiration of stale sources.
  * Updated the kernel interface to work with recent Linux kernels.
  * More tweaks to the order in which updates are sent.

7 April 2008: babel 0.12

  * Retractions are now sent multiple times, which should speed up
    convergence in presence of packet loss.
  * Optimised the sending of updates to make them smaller.
  * Don't forward requests multiple times; this should reduce the
    noise due to requests with no increase in convergence time.
  * Fixed a bug that could cause a crash when resending requests.
  * Added some protection against clock stepping.

29 March 2008: babel 0.11

  * Implemented sub-second hello and update intervals.
  * Fixed a bug that could prevent the best route from being selected
    for extended periods of time.
  * Implemented protection against out-of-date requests being sent and
    forwarded when a node loses its sequence number.
  * INCOMPATIBLE CHANGE: reduced the cost of wired networks down to 96
    from 128.
  * Tweaked the frequency at which a router's seqno increases, to make
    it more likely that a feasible route will be available when needed.
  * Implemented garbage collection of old sources.
  * Implemented coalescing of unicast messages.
  * Fixed a bug that could cause a crash when a link's MTU changes.
  * Fixed a bug that could delay noticing that a network is no longer
    idle when running Babel with the -i flag.
  * Fixed a bug that could cause incorrect metrics to be advertised
    when output filtering was used.
  * Fixed a bug that could cause incorrect link costs to be computed when
    a neighbour reduces its hello interval.
  * Fixed some minor issues with the ordering of outgoing messages.

11 March 2008: babel 0.10

  * Implemented the ability to automatically export local addresses (see
    the ``local'' keyword in redistribute specifications).  This should
    avoid the need to explicitly specify -X on the command line
    (Julien Cristau and Juliusz Chroboczek).
  * INCOMPATIBLE CHANGE: local routes (local interface addresses) are
    now exported by default.  Specify ``redistribute local deny'' to
    avoid that.
  * Babel will now automatically choose a router id if none is
    specified on the command line.
  * Automatically adapt to interfaces appearing or disappearing at runtime,
    as is usually the case when running over tunnels or VPNs.
  * Changed the link quality computation algorithm to not discard very
    lossy links.
  * Multi-hop requests will now be forwarded to an unfeasible successor
    under some circumstances.
  * Send multi-hop requests more aggressively.
  * Send requests for a new seqno upon receiving an unfeasible update
    if it's better than what we have.
  * No longer consider the age of routes in route selection.
  * Added ability to run as a daemon.

14 February 2008: babel 0.9

  * Implemented a proper configuration language to specify input and
    output filters and redistribution policies.
  * INCOMPATIBLE CHANGE: the flags -4, -x and -c are no longer supported.

8 February 2008: babel 0.8

  * Babel will now automatically check for interfaces' up/down status,
    IPv4 address, and optionally for carrier sense.
  * Implemented the -w option, which disables all optimisations for
    wired interfaces.
  * Implemented support for non-default routing tables.
  * Fixed a bug that could spuriously remove IPv4 routes (thanks to
    Julien Cristau).

3 January 2008: babel 0.7

  * Implemented support for IPv4.
  * Fixed sending of unicast requests.
  * Don't send poison when receiving a request for an unknown route.
  * Basic filtering infrastructure.
  * Removed support for broadcast IHU.
  * Changed the behaviour of -d.

16 October 2007: babel 0.6

  * Implemented resending of unsatisfied requests, with exponential backoff.
  * Fixed a potential crash in the request handling code.
  * Send IHUs more aggressively.

9 October 2007: babel 0.5

  * Implemented forwarding of requests and replies.
  * Fixed a bug that prevented requests from being parsed correctly.
  * Fixed a bug that prevented IHU intervals from being sent.
  * Respect reboot_time even after an id change.
  * Deal with neighbours rebooting and losing their hello seqno when
    computing link quality.

23 September 2007: babel 0.4

  * Fixed incorrect expiration of old sources.  This could prevent
    convergence in some cases.

16 September 2007: babel 0.3

  * Fixes to Mac OS X support (Grégoire Henry).

29 August 2007: babel 0.2

  * Made jitter computation depend on how urgent a given message is.
    This dramatically improves convergence speed, without increasing
    network load.
  * Fixed a bug that prevented neighbour associations from being
    discarded at shutdown.

22 August 2007: babel 0.1

  * Initial public release.