755 lines
25 KiB
Plaintext
755 lines
25 KiB
Plaintext
Internet Software Consortium
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Dynamic Host Configuration Protocol Distribution
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Version 2 Patchlevel 3
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July 19, 2000
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Release Notes
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Version 2 of the ISC DHCP Distribution includes the ISC DHCP server,
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DHCP Client and DHCP/BOOTP Relay Agent.
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This version has been in a near feature freeze since January of 1998,
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was in Beta test from that time to June of 1999, and has now been
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released in its final form. It has a number of important features,
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and is the release that we would expect most sites to run.
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For information on how to install, configure and run this software,
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as well as how to find documentation and report bugs, please consult
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the README file.
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CHANGELOG
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This log describes the changes that have been made in version 2.0
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since June of 1997.
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CHANGES FROM VERSION 2.0 PATCHLEVEL 2
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- Rather than calling a client environment setup script, set the
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environment up directly, so as to avoid any possible exploit making
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use of clever shell metacharacter hacks. This is a security fix
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that applies to the DHCP client *only*.
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CHANGES FROM VERSION 2.0 PATCHLEVEL 1
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- Fix a case where an unitialized pointer could result from an exceptional
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case in DHCPRELEASE and cause a core dump.
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CHANGES FROM VERSION 2.0
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- Clean up DHCPRELEASE support.
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- Don't use the broadcast flag when doing BOOTP unless we need to.
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- Clean up the fallback mess.
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- Quote all shell special characters in the client script.
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- Fix ethernet header alignment on arm32.
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- Clarify the "no subnet declaration" message.
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- Correctly store the tftp server name in the lease file and the
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client script file.
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- Avoid a potential spin loop in client when script file creation
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fails for reasons other than the presence of an existing file of the
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same name.
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- Add support for Linux kernel versions greater than 2.2.
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- Fix a problem in raw.c on Irix. Thanks to Don Badrak for the
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patch.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 29
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- Define BYTE_ORDER in includes/cf/hpux.h so that ip.h will compile
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correctly on HP-UX.
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- Fix a long-standing but minor bug in the way the program name for
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syslog was derived.
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- Fix a long-standing bug that prevented the DHCP server from broadcasting
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responses to BOOTP clients that requested a broadcast response.
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- In dhcprequest(), check to make sure that there's a lease before trying
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to acknowledge it to the client. This fixes a potential core dump that
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a few people observed.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 28
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- Fix some pastos I introduced when merging Andrew Chittenden's token
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ring support.
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- Apply a patch to the token ring support from Andrew Chittenden.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 27
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- Add dependencies to makefiles.
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- Don't use ping -w 1 in freebsd client script.
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- Token ring support for LPF, contributed by Andrew Chittenden.
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- Fix a subtle bug that would cause the server to respond incorrectly
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in some cases when the client sent duplicate DHCPREQUEST packets.
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- Fix option pretty printing for 'X' format.
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- Add some special cases to deal with DHCPREQUEST packets from RFC1541
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clients.
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- Fix an obscure bug in nested subnet mask handling.
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- Fix a bug in abandoned lease reclamation.
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- Allow maximum message size to be set in configuration file.
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- Allow parameter request list to be supplied in configuration file.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 26
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- Fix UDP/IP checksum code
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- Fix UDP payload length computation to prevent logging of spurious
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errors.
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- Support compilation on MacOS X
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- Add support for some options that were added in RFC2132.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 25
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- Use the udp header's length rather than computing the length based
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on the number of bytes received, because some broken relay agents
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send packets with ip lengths that are longer than then sum of the ip
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header size and the udp length.
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- Do path keyword substitution on unformatted manual pages before
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installing them.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 24
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- D'oh! Fix a really stupid mistake in hash.c.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 23
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- Support an always-reply-rfc1048 flag, which says to reply with an
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RFC1048-style vendor extensions buffer even if the client didn't
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send an RFC1048-style magic number.
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- Fix a null pointer dereference.
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- Use netmask from subnet if no netmask option specified.
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- IRIX support (thanks to Don Badrak).
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- Install unformatted manual pages on Linux.
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- Add note in README about zcat vs. gzcat on BSD/os.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 22
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- Test for lease before dereferencing it in dhcprequest.
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- Free the client parameter request list in dhcpnak if there is one.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 21
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- Fix a pasto in options.c that will cause a core dump whenever a
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client sends in a request without a parameter request list.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 20
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- Actually do the client fix mentioned below - Patchlevel 20 only contained
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half of the fix.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 19
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- Removed arp table clearing code from solaris client script.
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- Document Linux "protocol not configured" error more thoroughly.
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- Clean up some unused variables.
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- Add entry and exit hooks to all dhcp client scripts, along with a
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make_resolv_conf function that can be redefined in the entry hooks.
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Document this new feature set.
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- Fix client to take advantage of network APIs that allow it to
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receive a unicast instead of requesting that the DHCP server
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broadcast its response.
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- Add -pf flag to all daemons allowing user to specify PID file name
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on command line.
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- Undo a previous change that attempted to be clever about testing
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interface flags but wound up being stupid instead.
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- Enforce access control on DHCPREQUEST messages as well as
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DHCPDISCOVER messages.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 18
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- Support added for AIX 4.1.5.0 (and hopefully other versions).
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- Use /var/run instead of /etc on Digital Unix.
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- Change DHCP client exponential backoff code to back off more slowly,
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so that it is more robust in lossy environments, at the expense of
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being a bit less polite to the server.
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- Don't request a specific lease interval in the client unless the
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user says to do so.
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- Don't print DHCPXXX in wrong xxx messages unless DEBUG is defined.
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- Fix handling of secs field.
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- Fix handling of append statement.
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- Fix documentation for append and prepend statements.
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- Fix server support for parameter request list and maximum message
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size.
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- Parameterize more hardware types in discover_interfaces. Check for
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IFF_BROADCAST instead of !IFF_POINTOPOINT
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- Print kernel configuration warning message if we get EINVAL when
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opening or configuring the Linux packet filter.
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- Fix a bug in UDP checksum code (thanks to John Nemeth for figuring
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this out) and re-enable UDP checksumming. This allows the client
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to work with some buggy DHCP servers that can't handle zero
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checksums in the UDP header - in particular, the one John's cable
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modem ISP is using.
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- Don't report packet header checksum errors unless we see a lot of
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them. It's perfectly normal for some number of checksum errors to
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occur.
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- Refer to the dhcpd.leases man page when printing an error message
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prior to exiting because there's no lease database.
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- Add information to the README telling the reader how to get to the
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manual pages.
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- Fix the server packet transmission code to unicast when it can.
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- Fix a typo in the dhcpd.conf manual page.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 17
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- Fix a bug in the relay agent where messages to the client would be
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unicast in the IP header but broadcast in the link header. The
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Microsoft DHCP client would reject such packets, preventing it from
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being configured. This was only a problem on non-socket-API
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platforms.
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- Do not attempt to reclaim requested abandoned leases in response to
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DHCPDISCOVER messages.
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- Allow the maximum lease time parameter in a host declaration to
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override the maximum lease time parameter in a subnet declaration.
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- Better document the -p flag for dhclient, dhcrelay and dhcpd.
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- Apply John Wehle's patch to fix the endianness bug in the dlpi
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packet filter on Solaris.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 16
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- Fix linux man page install location.
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- Fix some confusion in the dhclient-script man page.
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- Fix error in includes/cf/linux.h that would have made network API
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selections in site.h work incorrectly.
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- Fix some major stupidity in the code that figures out where or not a
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client owns a particular lease.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 15
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- Fix Makefile.conf on Linux to refer to /var/state/dhcp instead of
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/var/state/dhcpd.
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- Eliminate redundant #defines in includes/cf/linux.h (for neatness).
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- Fix an obscure case where dhcpd is started by the /etc/rc system
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with exactly the same pid each time, dhcpd.pid is not erased on
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reboot, and therefore dhcpd would detect a server (itself) with the
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pid in dhcpd.pid and decide that another server was running and
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exit.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 14
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- Install the dhcp databases in /var/state/dhcp instead of /etc or
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/var/dhcpd, as suggested in the Linux Filesystem Hierarchy
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Standard.
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- Fix an endianness bug in dlpi.c. As a consequence, make the
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Solaris/i386 use dlpi again.
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- Fix a bunch of bugs in the Solaris client script.
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- Add some more information about Solaris to the README file.
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- Adjust startup message in interface probe so that the relay agent
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and client's unattached status will not trigger questions.
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- Update some error messages to provide more help to new users for
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some common mistakes.
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- Create an interface alias on Solaris when setting up IP aliases,
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rather than trying to do things the *BSD way.
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- Fix a null pointer dereference bug (this time I went through the
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whole function and audited it for more null pointer dereferences,
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and I didn't find any, for what that's worth).
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- Don't ever release leases in response to a DHCPDISCOVER (I think
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this was unlikely anyway, but why not be correct?).
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- Remove the shared-network example from the sample dhcpd.conf file.
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- Make ``make install'' make all first.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 13
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- Support DESTDIR on installs.
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- Fix a bug in dhcp.c where a store through a null pointer would
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be made under some reasonably common circumstances.
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- Add test for ARPHRD_TUNNEL so that client and server do not fail on
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versions of Linux running IPsec implementations or the like.
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- Move tests for constants defined in O.S. headers into osdep.h - test
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for HAVE_whatever in .c files. Define relevant HAVE_whatevers in
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linux.h, so that versions of linux that define these constants as
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enums will still work.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 12
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- Initialize the "quiet" variable in dhclient.c to zero (it was used
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without first having been initialized).
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- Fix the parser code for the authoritative keyword.
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- Adjust lease discovery code to NAK more aggressively for addresses
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the server knows it owns.
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- Add several new messages for DHCPNAK.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 11
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- Use DLPI only on sparcs running Solaris, since it seems not to work
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on i386 boxes running Solaris for reasons yet to be determined.
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- In the client, close standard I/O descriptors when forking a daemon.
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- Don't let large lease lengths wrap lease expiry times - just use
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what fits into a TIME value.
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- Fix a bug in the SIOCGIFCONF interface scanning code.
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- Fix a core dump in the interface scanner that crops up on Linux when
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an interface is specified on the command line.
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- Don't use %D in strftime because egcs complains about it.
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- Print the error message if SO_BINDTODEVICE fails.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 10
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- Update top-level Makefile so that it exits correctly on errors in
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submakes under bash/gnu make (dunno which is the culprit, and don't
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really care).
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- Print a more helpful message if no free BPF devices are found.
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- Add support for specifying that the server is or is not
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authoritative for a particular network segment.
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- Fix two stupid typos in lpf.c.
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- Print a more helpful message if we can't create an LPF socket or
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can't attach a filter to it.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 9
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- Correct the hopelessly outdated information about Linux at the top
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of the README - many apologies to the Linux people who have had to
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read that nonsense for the past couple of snapshots and have been
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confused or annoyed by it. I simply hadn't read it recently, and
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didn't realize how out-of-date it was.
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- Print a message if the client finds no broadcast interfaces to
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configure.
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- Add support for use-lease-addr-for-default-route flag in server, so
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that Windows machines can be made to ARP for all addresses.
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- Update README file to mention new Linux gotchas.
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- After finally understanding Brian Murrel's code (my fault, not his)
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to get interface names from /proc/net/dev on Linux, fix what I broke
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of his code and document it.
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- Use sendto rather than send for SOCK_PACKET sockets, because they
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can't be connected, only bound. :'(
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- Fix up SOCK_PACKET creation so that the kernel doesn't complain
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about it.
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- Fix incorrect tests in linux client script:
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[ $relmajor == 2 ] -> [ $relmajor -eq 2 ]
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- Make typedefs for u8, u16 and u32 types. These are Linux kernel
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internal data types which are unfortunately exposed in the linux
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packetfilter header file.
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- Don't include <net/ethernet.h> in lpf.c - it defines things we're
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already correctly defining elsewhere, and doesn't define any useful
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new stuff.
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- Finally fix client PREINIT bug that causes interfaces not specified
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on the command line to be preinitialized. If no interfaces are
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specified on the command line, all interfaces are still
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preinitialized.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 8
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- Fix socket API fallback setup code, which was causing Linux servers
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and clients to loop endlessly on select when run as daemons.
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- Add support for Linux 2.2 version number (treated the same as Linux
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2.1, for now).
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- Correct apparent error in DHCPREQUEST destination address handling
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when in INIT-REBOOT state.
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- Do not set BROADCAST flag if we have a valid IP address.
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- Remove hard-coded filenames and use system-specific manifest
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constants.
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- Add entry and exit hooks to Linux dhclient-script (should be added
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to all operating systems once tested).
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- Test for linux major and minor version so as to correctly invoke
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network configuration programs.
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- Add support for Linux's gratuitous name change of bpf_insn structure
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(can't pollute precious Linux sources with the "Berkeley" word, I
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guess.
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- Correct USE_BPF_{SEND,RECEIVE} ifdefs for if_reinitialize_*
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functions.
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- Ensure that we have ifreq structure before initializing interface -
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if an interface was specified on the command line on Linux, this was
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not the case.
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- Get rid of references to enstamp structure in lpf.c. Correctly
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declare and initialize sock_fprog structure (aka bpf_filter
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structure on non-Linux machines).
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- Define ssize_t on Ultrix.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 7
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- Generalize FDDI support.
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- Fix potential core dump in interface discovery code.
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- Put explicit release versions on startup messages.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 6
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- Add support for Linux Packet Filter (thanks to Brian Murrell, Interlinx).
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- Add support for FDDI hardware type.
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- Fix a long-standing bug in DLPI support where the ethertype was
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being set incorrectly (thanks to Gong Wei, CCENet).
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- Don't use DLPI RAW mode on Solaris.
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- In the client, when a lease expires, the interface to which that
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lease is attached is unconfigured. On systems that use the socket
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API, the interface needs to then be reconfigured with the 0.0.0.0
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address so that it can be used to get a new address.
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- Add fallback support for Linux. This fixes a problem with the
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relay agent when relaying over non-broadcast links, and may also fix
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some obscure problems with unicasting DHCPACKs in both the server and
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relay agent.
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- When allocating leases, if the oldest lease is abandoned, try to
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find a younger-but-still-expired lease rather than reclaiming the
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abandoned lease.
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- Add more documentation to README.
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- The absence of the /etc/dhclient.conf file is no longer considered
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an error.
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- The dhcp client's lease file name can be specified on the command
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line.
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- The DHCP client should no longer zap interfaces that it has not been
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directed to configure.
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- If a client starts up in the init-reboot state, the xid will be a
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"random" number rather than always being zero, as was previously the
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case.
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- In addition to comparing transaction IDs, compare hardware addresses
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in response packets to verify that they are ours.
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- Rewrite the client lease database after 20 leases have been written.
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- Fix the exponential backoff code.
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- Add a Y2k comment to indicate that something suspicious-looking is
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in fact _not_ a problem.
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- Use mkstemp if possible.
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- Add missing fi in various client scripts.
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- Use "search" instead of "domain" in linux resolv.conf files.
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- Specify a hop count in all route command on solaris.
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- If an allocation fails, don't try to zero out the allocation buffer
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we didn't get.
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- Support subnets that are subsets of other subnets - that is, for
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example, 10.0.1.0/24 and 10.0.0.0/16. This is useful in fairly
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obscure circumstances.
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- Don't set the lease end time if it's already expired.
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- Don't define INADDR_LOOPBACK on FreeBSD if it's already defined in a
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system header.
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- Use the broadcast address in the relay agent if we are using the BSD
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socket API.
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- Allow host declarations without names.
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|
|
- Allow the server identifier option to be specified.
|
|
|
|
- Don't dump hostnames into the lease file if they contain
|
|
non-printable characters.
|
|
|
|
- Copy the entire client hardware address buffer that the client sends
|
|
to the output packet, not just the portion of it that's supposedly
|
|
significant according to the hardware address length field. This
|
|
is done for the benefit of certain Microsoft clients.
|
|
|
|
- Don't send a second ICMP echo request if we receive two DHCPDISCOVER
|
|
messages in quick succession. This prevents a rather annoying
|
|
timing race in configuring some Win95 clients.
|
|
|
|
- Fix up dhcp-options man page to make it more readable. Note that
|
|
netbios-name-server is the same thing as WINS.
|
|
|
|
CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 5
|
|
|
|
- Define some extra DLPI support flags that make DLPI work much better
|
|
on Solaris.
|
|
|
|
- Fix inet_aton prototype/declaration to match Internet Software
|
|
Consortium BIND distribution.
|
|
|
|
- Document new server-identifier functionality.
|
|
|
|
CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 4
|
|
|
|
- Do not use -Wstrict-prototypes on Solaris with gcc - if the Internet
|
|
Software Consortium BIND distribution is not installed, this produces
|
|
errors.
|
|
|
|
- Actually use the new DLPI support on Solaris - although the code was
|
|
added in Patchlevel 2, it wasn't enabled (blush).
|
|
|
|
- Fix a prototype bug that's exposed when DLPI support is enabled on
|
|
Solaris.
|
|
|
|
CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 3
|
|
|
|
- Fix a makefile botch that prevents the DHCP Distribution from
|
|
from compiling on Solaris with gcc. Sigh.
|
|
|
|
CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 2
|
|
|
|
- Allow server-identifier in any scope. Use in-scope server
|
|
identifier option rather than the default, if one exists.
|
|
|
|
- Delete newlines from abandoned lease reclaimation warning.
|
|
|
|
- Only release other applicable leases held by a client when the
|
|
client sends a DHCPREQUEST.
|
|
|
|
- Fix core dump when find_lease didn't find a lease.
|
|
|
|
- Update dhcpd.leases man page.
|
|
|
|
CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 1
|
|
|
|
- Use -Wno-char-subscript on Solaris to prevent bogus warnings from
|
|
gcc on Solaris 2.6.
|
|
|
|
- Add support for Apple's new Rhapsody operating system.
|
|
|
|
- Use DLPI on Solaris instead of using the BSD Sockets API.
|
|
|
|
- Fix two network input buffer overflow problems which could allow an
|
|
attacker to pervert the stack.
|
|
|
|
- Fix an ancient typo that could theoretically cause memory
|
|
corruption.
|
|
|
|
- Sort abandoned leases in at current time rather than end of time.
|
|
This allows abandoned leases to be reclaimed if there are no
|
|
available free leases.
|
|
|
|
- If a client explicitly requests a lease that's been abandoned, it's
|
|
probably the system that was answering pings on that address, so let it
|
|
have the lease.
|
|
|
|
- Fix a bunch of type conversion errors that are flagged by the Solaris
|
|
C compiler.
|
|
|
|
CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 0
|
|
|
|
- Fix two potential buffer overflow problems.
|
|
|
|
- Differentiate between versions of Linux for better success in
|
|
compiling.
|
|
|
|
- Fix bug in linux client script regarding routing setup.
|
|
|
|
- Clarify socket API error message on multiple interfaces.
|
|
|
|
- Fix broken comparison that was setting IP source address to zero.
|
|
|
|
- Reclaim abandoned leases if we run out of free leases.
|
|
|
|
CHANGES FROM THE DECEMBER 2, 1997 SNAPSHOT
|
|
|
|
- Use %ld to print pid_t and cast pid_t values to long to avoid
|
|
inconsistent declarations between different POSIX flavours.
|
|
|
|
- Add support for ARPHRD_IEEE802 (token ring) hardware type.
|
|
|
|
- If we own an address and a client requests it, but we can't assign
|
|
it to that client, we now NAK it so that the client doesn't try to
|
|
reuse it.
|
|
|
|
CHANGES FROM THE JUNE SNAPSHOT
|
|
|
|
- Support for NeXTstep 3.x and 4.x
|
|
|
|
- Added man pages for dhcpd.leases, dhclient-script, dhclient.leases
|
|
and dhclient.conf. Move general documentation of DHCP options into
|
|
a seperate man page which is referred to by the dhclient.conf and
|
|
dhcpd.conf man pages.
|
|
|
|
- Updated README to answer some frequently asked questions.
|
|
|
|
- Fixed a bug in command-line interface specification in dhclient - it
|
|
was formerly not possible to specify that only certain interfaces be
|
|
configured.
|
|
|
|
- Do not leave client scripts lying around in /tmp after they've been
|
|
used unless the -D flag is specified.
|
|
|
|
- Add a new, non-standard, not-guaranteed-to-stay-the-same system
|
|
configuration status message server which can be used to trigger the
|
|
client to recheck its address, e.g., after a laptop has been put to
|
|
sleep and then awakened (this has yet to be documented).
|
|
|
|
- Fix handling of media selection in the REBOOT phase - previously the
|
|
media type would not be remembered, which could cause severe delays
|
|
in reacquiring an address if the default media type was wrong.
|
|
|
|
- Allocate space for a NUL terminator on the end of client options -
|
|
this was previously overlooked, and could cause garbage characters
|
|
to be written to the temporary client script files.
|
|
|
|
- Use mkstemp if it's available.
|
|
|
|
- Supply network number and broadcast address to the client script so
|
|
that on systems that need these values, they don't need to be
|
|
computed with an awk script.
|
|
|
|
- Keep a PID file for the client and the relay agent, and have the
|
|
relay agent background itself by default.
|
|
|
|
- Add client script for bsd/os, fix many niggling bugs in existing
|
|
client scripts and add support for static routing tables to all bsd
|
|
scripts.
|
|
|
|
- Add a -q option to the client, server and relay agent so that they
|
|
can be started from /etc/rc scripts without spewing a bunch of
|
|
garbage on the console. By default, all three daemons still print
|
|
startup messages, since these are helpful in bug reporting.
|
|
|
|
- Don't print anything to stderr or stdout after going into
|
|
background.
|
|
|
|
- Fix bug where hostname keyword was not being recognized in
|
|
dhcpd.leases file, resulting in the loss of lease database entries.
|
|
|
|
- Fix problem on some operating systems where zero-length ifreq
|
|
structures were being offset incorrectly when scanning the interface
|
|
list on startup.
|
|
|
|
- Unless a BOOTP client requests it, never send more than 64 bytes of
|
|
options.
|
|
|
|
- Don't ping static leases, since we don't have a lease structure on
|
|
the heap to work with later.
|
|
|
|
- Fixed a compile problem on Solaris 2.6.
|
|
|
|
- Support interface aliases on Solaris.
|
|
|
|
- Print day and month with leading zero in lease files if less than
|
|
ten, for easier parsing by perl/sed/awk scripts.
|
|
|
|
- Never make the lease database world writable, even if dhcpd is
|
|
invoked with a bogus umask.
|
|
|
|
- Fix DHCPRELEASE handling (before, addressed would never be
|
|
released.)
|
|
|
|
- If there is more than one lease for a particular client on a
|
|
particular network, find the lease the client is asking for so as to
|
|
avoid a cycle of NAKs.
|
|
|
|
- If a BOOTP request is received from a particular client and that
|
|
client has previously received a DHCP address, make sure that we
|
|
still find a valid BOOTP lease so that we don't cycle through
|
|
addresses.
|
|
|
|
- Remove server-identifier option from documentation, other than to
|
|
document that it has been deprecated.
|
|
|
|
- Don't give up if we get an EINTR or EAGAIN while polling or
|
|
selecting - these return statuses can occur spuriously without
|
|
indicating a fatal problem.
|
|
|
|
- Do not select for exceptions, since we don't handle them. This was
|
|
causing massive CPU consumption on some systems.
|
|
|
|
- When a DHCP client has been assigned a fixed address but had
|
|
previously had a lease, it will request the old leased address. In
|
|
such an event, send a DHCPNAK so that it will discover its new
|
|
static binding.
|