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[#221] README and RELNOTES updated (dhclient,dhcrelay reached EOL)

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28
README
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@ -1,6 +1,6 @@
Internet Systems Consortium DHCP Distribution
Version 4.4.2
22 January 2020
Version 4.4.3
26 January 2022
README FILE
@ -62,13 +62,15 @@ documented in the dhclient-script man page. The format of the DHCP
client lease database is documented in the dhclient.leases man page.
The source for all these man pages is in the client/ subdirectory in
the distribution. In addition, the dhcp-options man page should be
referred to for information about DHCP options.
referred to for information about DHCP options. The client component
is reaching End-of-Life and will not be part of future releases.
DHCP relay agent documentation is in the dhcrelay man page, the source
for which is distributed in the relay/ subdirectory.
for which is distributed in the relay/ subdirectory. The relay component
is reaching End-of-Life and will not be part of future releases.
KEA Migration Assistant documentation, including how to build, install
and use it, is including in the keama directory.
and use it, is including in the keama/ directory.
To read installed manual pages, use the man command. Type "man page"
where page is the name of the manual page. This will only work if
@ -97,12 +99,12 @@ directory, it may not have up-to-date information).
To build the DHCP Distribution, unpack the compressed tar file using
the tar utility and the gzip command - type something like:
gunzip dhcp-4.4.2.tar.gz
tar xvf dhcp-4.4.2.tar
gunzip dhcp-4.4.3.tar.gz
tar xvf dhcp-4.4.3.tar
CONFIGURING IT
Now, cd to the dhcp-4.4.2 subdirectory that you've just created and
Now, cd to the dhcp-4.4.3 subdirectory that you've just created and
configure the source tree by typing:
./configure
@ -396,14 +398,17 @@ your problem is a bug, and not user error, or if your bug report
includes a patch, you can submit it to our ticketing system at
https://gitlab.isc.org/isc-projects/dhcp/issues. If you have not received
a notice that the ticket has been resolved, then we're still working on it.
Notice that this is the final release that features client and relay
components. Reporting bugs in them makes limited sense. The ISC team
will not be fixing any issues related to client or relay. They may be
useful for other users to document some problems or perhaps discuss
and share workarounds.
PLEASE DO NOT REPORT BUGS IN OLD SOFTWARE RELEASES! Fetch the latest
release and see if the bug is still in that version of the software,
and if it is still present, _then_ report it. ISC release versions
always have three numbers, for example: 1.2.3. The 'major release' is
1 here, the 'minor release' is 2, and the 'maintenance release' is 3.
ISC will accept bug reports against the most recent two major.minor
releases: for example, 1.0.0 and 0.9.0, but not 0.8.* or prior.
PLEASE take a moment to determine where the ISC DHCP distribution
that you're using came from. ISC DHCP is sometimes heavily modified
@ -483,7 +488,8 @@ agent. DHCP 3 was released in October 2001 and included DHCP failover
support, OMAPI, Dynamic DNS, conditional behaviour, client classing,
and more. Version 3 of the DHCP server was funded by Nominum, Inc.
The 4.0 release in December 2007 introduced DHCPv6 protocol support
for the server and client.
for the server and client. The client and relay components reached
their End-of-Life in January 2022.
This product includes cryptographic software written
by Eric Young (eay@cryptsoft.com).

97
RELNOTES
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@ -1,6 +1,6 @@
Internet Systems Consortium DHCP Distribution
Version 4.4.2
22 January 2020
Version 4.4.3
26 January 2022
Release Notes
NEW FEATURES
@ -9,84 +9,35 @@ Please note that that ISC DHCP is now licensed under the Mozilla Public License,
MPL 2.0. Please see https://www.mozilla.org/en-US/MPL/2.0/ to read the MPL 2.0
license terms.
While release 4.4.2 is primarily a maintenance release that addresses a number
of defects, it does introduce a few new features:
NOTE: The client and relay components are reaching their End-Of-Life cycle.
4.4.3 is the final release that features them.
- Keama - Keama is a migration utility that assists in converting ISC DHCP
server configuration files to Kea configuration files. It is found in the
keama subdirectory and includes a README.md file with instructions on how
to build it as well as a manpage on its usage.
While release 4.4.3 is primarily a maintenance release that addresses a number
of issues, it does introduce a few of small new features:
- Two new server parameters related to ping checking were added:
1. BIND libraries updated to the latest 9.11.36. This fixes a number of compilation
issues on various systems, including OpenWRT.
[gitlab #218, #171, #180, #192]
1. ping-cltt-secs which allows the user to specify the number of seconds
that must elapse since CLTT before a ping check is conducted.
2. Improve PRNG initialization. There is now a new configure flag --with-randomdev=PATH
that specifies the device to read the initial seed from. That is typically
/dev/random (the default value) or /dev/urandom, but may be other as preferred on
your system. If this option is enabled, dhclient will use the file as a seed. If
not, the earlier algorithm (get last 4 bytes of hardware addresses from all network
interfaces that have them, use current time and process ID).
2. ping-timeout-ms which allows the user to specify the amount of time the
server waits for a ping-check response in milliseconds rather than in
seconds.
3. The IPv6-only preferred option, defined in RFC8925, is now supported.
[gitlab #132]
In general, the areas of focus for ISC DHCP 4.4 were:
4. Compilation fixed for gcc-10.
[gitlab #117]
1. Dynamic DNS additions
2. dhclient improvements
3. Support for dynamic shared libraries
5. Client fix: wrong argument to memcpy()
[gitlab #190]
Dynamic DNS Improvements:
- We added three new server configuration parameters which influence DDNS
conflict resolution:
1. ddns-dual-stack-mixed-mode - alters DNS conflict resolution behavior
to mitigate issues with non-compliant clients in dual stack environments.
2. ddns-guard-id-must-match - relaxes the DHCID RR client id matching
requirement of DNS conflict resolution.
3. ddns-other-guard-is-dynamic - alters dual-stack-mixed-mode behavior to
allow unguarded DNS entries to be overwritten in certain cases
- The server now honors update-static-leases parameter for static DHCPv6
hosts.
dhclient Improvements:
- We've added three command line parameters to dhclient:
1. --prefix-len-hint - directs dhclient to use the given length as
the prefix length hint when requesting prefixes
2. --decline-wait-time - instructs the client to wait the given number
of seconds after declining an IPv4 address before issuing a discover
3. --address-prefix-len - specifies the prefix length passed by dhclient
into the client script (via the environment variable ip6_prefixlen) with
each IPv6 address. We added this parameter because we have changed the
default value from 64 to 128 in order to be compliant with RFC3315bis
draft (-09, page 64) and RFC5942, Section 4, point 1.
**WARNING**: The new default value of 128 may not be backwardly compatible
with your environment. If you are operating without a router, such as
between VMs on a host, you may find they cannot see each other with prefix
length of 128. In such cases, you'll need to either provide routing or use
the command line parameter to set the value to 64. Alternatively you may
change the default at compile time by setting DHCLIENT_DEFAULT_PREFIX_LEN
in includes/site.h.
- dhclient will now generate a DHCPv6 DECLINE message when the client script
indicates a DAD failure
Dynamic shared library support:
Configure script, configure.ac+lt, which supports libtool is now provided
with the source tar ball. This script can be used to configure ISC DHCP
to build with libtool and thus use dynamic shared libraries.
Other Highlights:
- The server now supports dhcp-cache-threshold for DHCPv6 operations
- The server now supports DHPv6 address allocation based on EUI-64 DUIDs
- Experimental support for alternate relay port in the both the server
and relay for IPv4, IPv6 and 4o6 (see: draft-ietf-dhc-relay-port-10.txt)
6. The server's limit on the size of lease file that can be loaded at start up
is now only enforced on 32-bit systems.
[gitlab #64]
For information on how to install, configure and run this software, as
well as how to find documentation and report bugs, please consult the