Bug#831466: systemd: please make IPv6 user space code run time configurable

[Marc Haber]

Package: systemd
Version: 230-5pitti1
Severity: important

Dear Maintainer,

since a few months, systemd upstream tries to implement parts of IPv6
inside systemd/networkd while we have perfectly working code inside
the Linux kernel. Unfortunately, the systemd code is wrong in so many
places that it literally takes days to diagnose the new
misbehavior-of-the-day, making it necessary to build complex test labs
or to break existing productive systems just to find out what is wrong
in systemd's IPv6 code this week.

Nevertheless, upstream has decided to make this new code mandatory,
making it necessary for distributions to derive patches to disable the
misbehavior. This takes, again, valuable developer time.

Please convince upstream to implement a run-time switch to revert to
the kernel IPv6 code just in case a system actually needs working
IPv6. It would be so much easier to help upstream to develop reliable
code if switching back and forth between kernel and user space code
was not so damn hard.

Greetings
Marc