Your message dated Sat, 10 Jan 2026 21:47:06 +0000
with message-id <[email protected]>
and subject line Bug#1088852: fixed in ifupdown 0.8.44+deb13u1
has caused the Debian Bug report #1088852,
regarding ifupdown: Cannot bring interface up when inet6 set to dhcp and using
isc-dhcp-client
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.
(NB: If you are a system administrator and have no idea what this
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--
1088852: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1088852
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: ifupdown
Version: 0.8.44
Severity: normal
Hi -
When /etc/network/interfaces is configured with the inet6 address family
of type "dhcp" and isc-dhcp-client is used as the DHCP client, DHCPv6
doesn't appear to work properly:
(janeway:20:36:EST)% sudo ifup eth0
Internet Systems Consortium DHCP Client 4.4.3-P1
Copyright 2004-2022 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Can't bind to dhcp address: Cannot assign requested address
Please make sure there is no other dhcp server
running and that there's no entry for dhcp or
bootp in /etc/inetd.conf. Also make sure you
are not running HP JetAdmin software, which
includes a bootp server.
If you think you have received this message due to a bug rather
than a configuration issue please read the section on submitting
bugs on either our web page at www.isc.org or in the README file
before submitting a bug. These pages explain the proper
process and the information we find helpful for debugging.
exiting.
ifup: failed to bring up eth0
(janeway:20:36:EST)% ifconfig eth0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.3.8.98 netmask 255.255.255.252 broadcast 10.3.8.99
inet6 2620:6:2000:12c:250:56ff:fe1a:aaab prefixlen 64 scopeid
0x0<global>
inet6 fe80::250:56ff:fe1a:aaab prefixlen 64 scopeid 0x20<link>
ether 00:50:56:1a:aa:ab txqueuelen 1000 (Ethernet)
RX packets 3554 bytes 1100609 (1.0 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3944 bytes 458573 (447.8 KiB)
TX errors 0 dropped 1 overruns 0 carrier 0 collisions 0
(janeway:20:36:EST)% systemctl --failed
UNIT LOAD ACTIVE SUB DESCRIPTION
● networking.service loaded failed failed Raise network interfaces
Legend: LOAD → Reflects whether the unit definition was properly loaded.
ACTIVE → The high-level unit activation state, i.e. generalization of
SUB.
SUB → The low-level unit activation state, values depend on unit
type.
1 loaded units listed.
As a result, networking.service is listed failed and the stateful
address from DHCPv6 is never applied to the interface. If called
manually, the stateful address is correctly applied:
(janeway:20:36:EST)% sudo dhclient -6 eth0
(janeway:20:36:EST)% ifconfig eth0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.3.8.98 netmask 255.255.255.252 broadcast 10.3.8.99
inet6 2620:6:2000:12c:250:56ff:fe1a:aaab prefixlen 64 scopeid
0x0<global>
inet6 fe80::250:56ff:fe1a:aaab prefixlen 64 scopeid 0x20<link>
inet6 2620:6:2000:12c::22bb prefixlen 128 scopeid 0x0<global>
<<<<------ added, but this should have been there upon ifup eth0
ether 00:50:56:1a:aa:ab txqueuelen 1000 (Ethernet)
RX packets 16967 bytes 3565104 (3.3 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 17090 bytes 2126654 (2.0 MiB)
TX errors 0 dropped 1 overruns 0 carrier 0 collisions 0
This used to work for years(?) but now no longer does. I'm not sure
when it broke, to be honest.
- Mark
-- Package-specific info:
--- /etc/network/interfaces:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet static
address 10.3.8.98
netmask 255.255.255.252
gateway 10.3.8.97
iface eth0 inet6 dhcp
accept_ra 1
autoconf 1
--- up and down scripts installed:
/etc/network/if-down.d:
total 4
lrwxrwxrwx 1 root root 33 Mar 1 2024 bridge ->
/usr/lib/bridge-utils/ifupdown.sh
-rwxr-xr-x 1 root root 759 Dec 9 2022 resolved
/etc/network/if-post-down.d:
total 0
lrwxrwxrwx 1 root root 33 Mar 1 2024 bridge ->
/usr/lib/bridge-utils/ifupdown.sh
/etc/network/if-pre-up.d:
total 0
lrwxrwxrwx 1 root root 33 Mar 1 2024 bridge ->
/usr/lib/bridge-utils/ifupdown.sh
/etc/network/if-up.d:
total 16
-rwxr-xr-x 1 root root 721 Jun 11 2012 lprng
-rwxr-xr-x 1 root root 1129 Mar 10 2024 ntpsec-ntpdate
-rwxr-xr-x 1 root root 4665 Jun 28 2023 resolved
-- System Information:
Debian Release: trixie/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (x86_64)
Foreign Architectures: amd64
Kernel: Linux 6.11.10-amd64 (SMP w/1 CPU thread; PREEMPT)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages ifupdown depends on:
ii adduser 3.137
ii iproute2 6.12.0-1
ii libc6 2.40-3
Versions of packages ifupdown recommends:
ii isc-dhcp-client [dhcp-client] 4.4.3-P1-5
Versions of packages ifupdown suggests:
pn ppp <none>
pn rdnssd <none>
-- debconf information:
ifupdown/convert-interfaces: true
--- End Message ---
--- Begin Message ---
Source: ifupdown
Source-Version: 0.8.44+deb13u1
Done: Daniel Gröber <[email protected]>
We believe that the bug you reported is fixed in the latest version of
ifupdown, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Daniel Gröber <[email protected]> (supplier of updated ifupdown package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Format: 1.8
Date: Thu, 08 Jan 2026 14:17:04 +0100
Source: ifupdown
Architecture: source
Version: 0.8.44+deb13u1
Distribution: trixie
Urgency: medium
Maintainer: Debian Networking Team <[email protected]>
Changed-By: Daniel Gröber <[email protected]>
Closes: 1088852 1122511
Changes:
ifupdown (0.8.44+deb13u1) trixie; urgency=medium
.
* Fix ifup regression where it would return before IPv6 DAD had
completed allowing boot to proceed and causing subsequent service
start failures with "Cannot assign requested" or "Address not available".
(Closes: #1122511)
* Fix ifup regression calling dhclient before IPv6 link-locals are
available on interface.
(Closes: #1088852)
* Fix execable() returning false for scripts in lib(exec) causing the
above regressions. This underlying bug was introduced in 0.8.42.
* Add myself to Uploaders.
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