Your message dated Wed, 05 Aug 2026 17:31:09 +0000
with message-id <[email protected]>
and subject line Bug#1143544: Removed package(s) from unstable
has caused the Debian Bug report #1085231,
regarding isc-dhcp-client: Debian dhclient-script does not wait for DAD on
configured address
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
1085231: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1085231
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: isc-dhcp-client
Version: 4.4.3-P1-5
Severity: normal
Tags: ipv6
X-Debbugs-Cc: [email protected]
Dear Maintainer,
dhclient provides a --dad-wait-time option which suggests that the
dhclient-script should not return immediately after configuring a new
address, but should wait for Duplicate Address Detection (DAD) to
complete. The upstream example dhclient-script does so [0], as does
the Fedora version based on it. The Debian version, however does not
[1].
This means that dhclient -6 can easily return with the discovered
address in tentative state, and therefore unusable. This can be
reproduced easily using the "pasta" tool (in 'passt' package) which
will create a network namespace and includes a built-in DHCPv6 server:
Note that the manual ifup and sleep here is to work around a different
bug [3].
$ pasta -I exampleif -- sh -c "ip link set exampleif up; sleep 2; dhclient -6
exampleif; ip -6 a show dev exampleif -dynamic scope global"
Multiple default IPv6 routes, picked first
2: exampleif: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state
UNKNOWN group default qlen 1000
inet6 2001:4479:e300:7200:222:4dff:fea6:88f3/128 scope global tentative
valid_lft forever preferred_lft forever
Note that the assigned address is tentative (and therefore not
usable). If we add an additional sleep to wait for DAD to complete:
$ pasta -I exampleif -- sh -c "ip link set exampleif up; sleep 2; dhclient -6
exampleif; sleep 2; ip -6 a show dev exampleif -dynamic scope global"
Multiple default IPv6 routes, picked first
2: exampleif: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state
UNKNOWN group default qlen 1000
inet6 2001:4479:e300:7200:222:4dff:fea6:88f3/128 scope global
valid_lft forever preferred_lft forever
.. the address becomes non-tentative.
[0]
https://github.com/isc-projects/dhcp/blob/572032cb0e514606559de3784e3f7ca8e1539d17/client/scripts/linux#L183
[1]
https://salsa.debian.org/debian/isc-dhcp/-/blob/master/debian/dhclient-script.linux?ref_type=heads#L398
[3] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1085229
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-- System Information:
Debian Release: trixie/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)
Kernel: Linux 6.11.2-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages isc-dhcp-client depends on:
ii debianutils 5.20
ii iproute2 6.11.0-1
ii libc6 2.40-3
Versions of packages isc-dhcp-client recommends:
ii isc-dhcp-common 4.4.3-P1-5
Versions of packages isc-dhcp-client suggests:
pn avahi-autoipd <none>
pn isc-dhcp-client-ddns <none>
pn resolvconf <none>
-- no debconf information
--- End Message ---
--- Begin Message ---
Version: 4.4.3-P1-8+rm
Dear submitter,
as the package isc-dhcp has just been removed from the Debian archive
unstable we hereby close the associated bug reports. We are sorry
that we couldn't deal with your issue properly.
For details on the removal, please see https://bugs.debian.org/1143544
The version of this package that was in Debian prior to this removal
can still be found using https://snapshot.debian.org/.
Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.
This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
[email protected].
Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)
--- End Message ---
