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The areas of focus for ISC DHCP 4.4 were:
1. Dynamic DNS additions
2. dhclient improvements
3. Support for dynamic shared libraries
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)
For information on how to install, configure and run this software, as
well as how to find documentation and report bugs, please consult the
README file.
ISC DHCP uses standard GNU configure for installation. Please review the
output of "./configure --help" to see what options are available.
The system has only been tested on Linux, FreeBSD, and Solaris, and may not
work on other platforms. Please report any problems and suggested fixes to
<dhcp-users@isc.org>.
ISC DHCP is open source software maintained by Internet Systems
Consortium. This product includes cryptographic software written
by Eric Young (eay@cryptsoft.com).
Changes since 4.4.0 (New Features)
- none
Changes since 4.4.0 (Bug Fixes)
- A delayed-ack value of 0 (the default), now correctly disables the delayed
feature. A change in 4.4.0 prohibited lease updates marking leases active
from be written to the lease file when delayed-ack is 0. This in turn,
caused servers to lose active lease assignments upon restart.
[ISC-Bugs #47141]
! Option reference count was not correctly decremented in error path
when parsing buffer for options. Reported by Felix Wilhelm, Google
Security Team.
[ISC-Bugs #47140]
CVE: CVE-2018-5733
! Corrected an issue where large sized 'X/x' format options were causing
option handling logic to overwrite memory when expanding them to human
readable form. Reported by Felix Wilhelm, Google Security Team.
[ISC-Bugs #47139]
CVE: CVE-2018-5732
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@comment $NetBSD: PLIST,v 1.6 2018/03/21 15:05:05 taca Exp $
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include/omapip/alloc.h
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include/omapip/buffer.h
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include/omapip/convert.h
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include/omapip/hash.h
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include/omapip/isclib.h
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include/omapip/omapip.h
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include/omapip/omapip_p.h
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include/omapip/result.h
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include/omapip/trace.h
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lib/libdhcp.a
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man/man5/dhcp-eval.5
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man/man5/dhcp-options.5
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share/doc/isc-dhcp/README
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share/doc/isc-dhcp/RELNOTES
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share/doc/isc-dhcp/References.txt
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