Bug#1076432: systemd: [networkd] incorrect IPv6 address generation

[Martin-Éric Racine]

Package: systemd
Version: 252.26-1~deb12u2
Severity: important
Tags: ipv6

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I have enabled networkd and created the following /etc/systemd/network/dhcp.network:

[Match]
Name=en* wl*

[Network]
DHCP=yes
IPv6PrivacyExtensions=yes
IPv6LinkLocalAddressGenerationMode=stable-privacy

Two issues:

1) networkd creates a new link address with the stable-privacy flag, in addition to the existing one created by the kernel on bootup.
2) Regardless, the stable-privacy flag is not inherited by the mngtmpaddr address. It steadfastly uses an EUI64 address.

Martin-Éric

- -- Package-specific info:

- -- System Information:
Debian Release: 12.6
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable-debug'), (500, 'stable')
Architecture: i386 (i586)

Kernel: Linux 6.1.0-22-686 (SMP w/1 CPU thread; PREEMPT)
Kernel taint flags: TAINT_CPU_OUT_OF_SPEC
Locale: LANG=fi_FI.UTF-8, LC_CTYPE=fi_FI.UTF-8 (charmap=UTF-8), LANGUAGE=fi:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages systemd depends on:
ii  libacl1            2.3.1-3
ii  libaudit1          1:3.0.9-1
ii  libblkid1          2.38.1-5+deb12u1
ii  libc6              2.36-9+deb12u7
ii  libcap2            1:2.66-4
ii  libcryptsetup12    2:2.6.1-4~deb12u2
ii  libfdisk1          2.38.1-5+deb12u1
ii  libgcrypt20        1.10.1-3
ii  libkmod2           30+20221128-1
ii  liblz4-1           1.9.4-1
ii  liblzma5           5.4.1-0.2
ii  libmount1          2.38.1-5+deb12u1
ii  libp11-kit0        0.24.1-2
ii  libseccomp2        2.5.4-1+deb12u1
ii  libselinux1        3.4-1+b6
ii  libssl3            3.0.13-1~deb12u1
ii  libsystemd-shared  252.26-1~deb12u2
ii  libsystemd0        252.26-1~deb12u2
ii  libzstd1           1.5.4+dfsg2-5
ii  mount              2.38.1-5+deb12u1

Versions of packages systemd recommends:
ii  dbus [default-dbus-system-bus]   1.14.10-1~deb12u1
ii  systemd-timesyncd [time-daemon]  252.26-1~deb12u2

Versions of packages systemd suggests:
ii  libfido2-1            1.12.0-2+b1
pn  libqrencode4          <none>
ii  libtss2-esys-3.0.2-0  3.2.1-3
ii  libtss2-mu0           3.2.1-3
pn  libtss2-rc0           <none>
ii  polkitd               122-3
pn  systemd-boot          <none>
pn  systemd-container     <none>
pn  systemd-homed         <none>
pn  systemd-resolved      <none>
pn  systemd-userdbd       <none>

Versions of packages systemd is related to:
ii  dbus-user-session  1.14.10-1~deb12u1
pn  dracut             <none>
ii  initramfs-tools    0.142
ii  libnss-systemd     252.26-1~deb12u2
ii  libpam-systemd     252.26-1~deb12u2
ii  udev               252.26-1~deb12u2

- -- Configuration Files:
/etc/systemd/journald.conf changed:
[Journal]
MaxFileSec=7day


- -- no debconf information

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