isc-dhcp 4.3.0a1 released

[Nicolas C.]

Hello,

The Alpha version of isc-dhcp has been released.

- If a client renews before 'dhcp-cache-threshold' percent of its lease
   has elapsed (default 25%), the server will reuse the allocated lease
   (provide a lease within the currently allocated lease-time) rather
   than extend or renew the lease.  This absolves the server of needing
   to perform an fsync() operation on the lease database before reply,
   which improves performance. [ISC-Bugs #22228]
   Update this patch to support asynchronous DDNS.  If the server is
   attempting to do DDNS on a lease it should be udpated and written to
   disk even if that wouldn't be necessary due to the thresholding
   [ISC-Bugs #26311]

- The 'no available billing' log line now also logs the name of the last
   matching billing class tried before failing to provide a billing.
   [ISC-Bugs #21759]

- A problem with missing get_hw_addr function when --enable-use-sockets
   was used is now solved on GNU/Linux, BSD and GNU/Hurd systems. Note
   that use-sockets feature was not tested on those systems. Client and
   server code no longer use MAX_PATH constant that is not defined on
   GNU/Hurd systems. [ISC-Bugs #25979]

- Add a perl script in the contrib directory, dhcp-lease-list.pl, which
   can parse v4 lease files and output the lease information in a more
   human friendly manner.  This was written by Christian Hammers with
   some updates by vom and ISC.  This is contributed code and is not
   supported by ISC; however it may be useful to some users.
   [ISC-Bugs #20680]

- Add support in v6 for on-commit, on-expire and on-release.
   [ISC-Bugs #27912

- Add support for using classes with v6.
   [ISC-Bugs #26510]

- Update the DDNS code to current standards and allow for sharing
   of DDNS entries between v4 and v6 clients.  The new code is used
   if the ddns-update-style is set to "standard", the older code is
   still available if ddns-update-style is set to "interim".  The
   oldest DDNS code "ad-hoc" has been removed.  Thanks to Thomas Pegeot
   who submitted a patch for this issue.  This patch is based on
   that work with some modifications.
   [ISC-Bugs #21139]

- Add a configuration option to the server to suppress using fsync().
   Enabling this option will mean that fsync() is never called.  This
   may provide better performance but there is also a risk that a lease
   will not be properly written to the disk after it has been issued
   to a client and before the server stops.  Using this option is
   not recommended.
   [ISC-Bugs #34810]

- Add some logging statements to indicate when the server is ready
   to serve.  One statement is emitted after the server has finished
   reading its files and is about to enter the dispatch loop.
   This is "Server starting service.".
   The second is emitted when a server determines that both it and
   its failover peer are in the normal state.
   This is "failover peer <name>: Both servers normal."
   [ISC-Bugs #33208]

- Add support for accessing options from v6 relays.  The v6relay
   statement allows the administrator to choose which relay to
   use when searching for an option, see the dhcp-options man page
   for a description.  The host-identifer option has also been
   updated to support the use of relay options see the dhcpd.conf
   man page for a description.
   [ISC-Bugs #19598]

- When doing DDNS if there isn't an appropriate zone statement attempt
   to find a reasoanble nameserver via a DNS resolver.  This restores
   some functionality that was lost in the transition to asynchronous
   DDNS.  Due to the lack of security and increase in fragility of the
   system when using this feature we strongly recommend the use of
   appropriate zone statements rather than using this functionality.
   [ISC-Bugs #30461]

- Add support for specifying the address from which to send
   DDNS updates on the DHCP server.  There are two new options
   "ddns-local-address4" and "ddns-local-address6" that each take
   one instance of their respective address types.
   [ISC-Bugs #34779]

- Add ignore-client-uids option in the server.  This option causes
   the server to not record a client's uid in its lease.  This
   violates the specification but may also be useful when a client
   can dual boot using different client ids but the same mac address.
   Thank you to Brian De Wolf for the patch.
   [ISC-Bugs #32427]
   [ISC-Bugs #35066]

- Extend the DHCPINFORM processing to honor the subnet selection option
   and take host declarations into account.
   Thanks to Christof Chen for testing and submitting the patch.
   [ISC-Bugs #35015]