ISC DHCP 4.3.1 is now available for download

Shawn Routhier sar at
Mon Aug 11 19:04:43 UTC 2014

ISC DHCP 4.3.1 is now available for download.

This is the release of ISC DHCP 4.3.1, a maintenance
release which contains a number of bug fixes.

Field testing is an important part of our quality process.  We welcome,
and need our user base to beta test our upcoming releases. Please report
bugs to dhcp-bugs at, and report that you have tried the release,
and any general observations, to dhcp-users at

A list of the changes in this release has been appended to the end
of this message.  For a complete list of changes from any previous
release, please consult the RELNOTES file within the source distribution.
They can also be found at:

Knowledge base articles about various features can be found starting from:

Webinars can be found here:

This release, and its OpenPGP-signatures are available now from:

ISC's Release Signing Key can be obtained at:

The following are changes that may be more interesting and require
a bit more explanation.

When one client is used to kill another client using the -x or -r options
it now logs that fact to syslog.

When a server is started and isn't in quiet mode it will now print out
information about the files it will attempt to use.

When a server is started with the --version option the version information
continues to be printed but is NOT sent to syslog to avoid filling up
the syslog with junk.

When a client is started with the -1 option it will now exit with a
return code of 2 if it declines the address.

We have added a new option "enable-log-pid" to the configure script.
When enabled this causes the client, server and relay programs to
include the PID number in any syslog messages they generate.  We
have chosen to set this to disabled by default in order to minimize
any disruption to running systems.

As part of the client code, expose the DHCPv4 next-server option to the
dhclient script.

The prefix length passed to the dhclient script can now be modified
at compile time by editing the includes/site.h file and #defineing
DHCLIENT_DEFAULT_PREFIX_LEN.  By default it is set to 64 in order
to minimize any disruptions to running systems.  A description of
some of the issues and some other workarounds can be found at:

The following is the list of all changes for this release.

                        Changes since 4.3.1rc1

- None

                        Changes since 4.3.1b1

- Modify the linux and openwrt dhclient scripts to process information
  from a stateless request.  Thanks to Jiri Popelka at Red Hat for the
  bug report and patch.
  [ISC-Bugs 36102]

- Remove more unused RCSID tags.  These weren't noticed in 4.3 as
  the code isn't used anymore but we remove them here to keep the
  code consistent across versions.
  [ISC-Bugs #36451]

                        Changes since 4.3.0

- Tidy up several small tickets.
  Correct parsing of DUID from config file, previously the LL type
  was put in the wrong place in the DUID string.
  [ISC-Bugs #20962] 
  Add code to parse "do-forward-updates" as well as "do-forward-update"
  Thanks to Jiri Popelka at Red Hat.
  [ISC-Bugs #31328]
  Remove log_priority as it isn't currently used.
  [ISC-Bugs #33397]
  Increase the size of the buffer used for reading interface information.
  [ISC-Bugs #34858]

- Remove an extra set of the msg_controllen variable.
  [ISC-Bugs #21035]

- Add a more understandable error message if a configuration attempts
  to add multiple keys for a single zone.  Thanks to a patch from Jiri
  Popelka at Red Hat.
  [ISC-Bugs #31892]

- Fix some minor issues in the dst code.
  [ISC-Bugs #34172]

- Properly #ifdef functions so that the code can compile without NSUPDATE.
  [ISC-Bugs #35058]

- Update the partner's stos (start time of state, basically when we last
  heard from this partner) field when updating the state in failover.
  [ISC-Bugs #35549]

- Modify the overload processing to allow space for the remote agent ID.
  [ISC-Bugs #35569]
  Handle the ordering of the SUBNET_MASK option even if it is the last
  option in the list.
  [ISC-Bugs #24580]

- Remove the code that allows a server to follow RFC3315 instead of
  the subsequent errata from August 2010 when determining which IAs
  to include if no addresses will be assigned.
  [ISC-Bugs #28938]

- Remove unused RCSID tags.
  [ISC-Bugs #35846]

- Correct the v6 client timing code.  When doing the timing backoff
  for MRT limit it to MRD.
  Thanks to Jiri Popelka at Red Hat for the bug report and fix.
  [ISC-Bugs #21238

- Add a log entry when killing a client and remove the PID files
  when a server, relay or client are killed.
  [ISC-Bugs #16970]
  [ISC-Bugs #17258]

- Some minor cleanups in the client code.
  In addition to checking for dhcpc check for bootpc in the services list.
  [ISC-Bugs #18933]
  Correct the client code to only try to get a lease once when the
  given the "-1" argument.
  Thanks to Jiri Popelka at Red Hat for the bug report and fix.
  [ISC-Bugs #26735]
  When asked for the version don't send the output to syslog.
  [ISC-Bugs #29772]
  Add the next server information to the environment variables for
  use by the client script.  In order to avoid changing the client
  lease file the next server information isn't written to it.
  Thanks to Tomas Hozza at Red Hat for the suggestion and a prototype fix.
  [ISC-Bugs #33098]

- Several updates to the dhcp server code.
  When not in quiet mode print out the files being used.
  [ISC-Bugs #17551]
  As accessing some pid files may require privileges move the dropping
  of permission bits due to the paranoia patch to be after the pid code.
  Thanks to Jiri Popelka at Red Hat for the bug report and fix.
  [ISC-Bugs #25806]
  When processing a "--version" request don't output the version information
  to syslog.

- Add the "enable-log-pid" build option to the configure script.  When enabled
  this causes the client, server and relay programs to include the PID
  number in syslog messages.
  Thanks to Marius Tomaschewski for the suggestion and proto-patch.
  [ISC-Bugs #29713]

- Add a #define to specify the prefix length used when a client attempts
  to configure an address.  This can be modified by editing includes/site.h.
  By default it is set to 64.  While 128 might be a better choice it would
  also be a change for currently running systems, so we have left it at 64.
  [ISC-Bugs #DHCP-2]

- Add a run time option to the client "-df" to allow the administrator to
  point to a second lease file the client can search for a DUID.  This can
  be used to allow a v4 and a v6 instance of the client to share a DUID.
  The second file will only be searched if there isn't a DUID in the main
  lease file and the DUID will be written out to the main lease file.
  [ISC-Bugs #34886]

- Have the client fsync the lease file to avoid lease corruption if the
  client hibernates or otherwise shuts down.
  [ISC-Bugs #35894]

- Add a check for L2VLAN in bpf.c to help support VLAN interfaces
  Thanks to Steinar Haug for the suggestion.
  [ISC-Bugs #36033]

- Modify the handling of the resolv.conf file to allow the DHCP
  process to start up even if the resolv.conf file has problems.
  [ISC-Bugs #35989]

- Add threshold logging functionality.  Two new options,
  log-threshold-low and log-threshold-high, indicate to the
  server if and when it should log an error message as addresses
  in a pool are used.
  [ISC-Bugs #34487]

- Add code to properly dereference a pointer in the dhclient code
  on an error condition.
  [ISC-Bugs #36194]

- Add code to help clean up soft leases.
  [ISC-Bugs #36304]

- Disable the gentle shutdown functionality until we can determine
  the best way to present it to remove or reduce the side effects.
  [ISC-Bugs #36066]

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