Bug#892794: systemd-networkd fails to configure IPv6 without MTU from RA

[Cyril Brulebois]

Hi Russ,

Russ Allbery <rra at debian.org> (2018-03-14):
> Cyril Brulebois <kibi at debian.org> writes:
> 
> > I've put up an amd64 build for stretch here:
> >   https://people.debian.org/~kibi/systemd/
> 
> > along with the source package. I'm also attaching the source debdiff.
> 
> > I'm not tagging this bug report with +patch yet, as this needs to be
> > tested on networks with and without advertised MTU (in case that doesn't
> > work in the latter case, reverting the commit introduced in the 9.4
> > point release might be just as good…).
> 
> Thank you!  I've built this for one of my systems where I was having this
> problem and upgraded systemd, libsystemd0, libpam-systemd, and
> libnss-resolve to the updated version.  I can confirm that IPv6 is still
> working fine on that system on a network that doesn't advertise an MTU,
> and I'm not seeing the errors in my logs.

Thanks for the confirmation!

I've just received a matching report:
 - without MTU, current packages: same error as you regarding the lack
   of data.
 - without MTU, patched packages: the error goes away, and the
   interface's MTU is used.
 - with specific MTU, both current and patched packages: the RA's MTU is
   used.

This seems to confirm two things:
 - the proposed patch fixes the regression;
 - the “let's look at the advertised MTU in the RA” feature introduced
   by the last upload still works fine.

So it looks to me we should consider going forward with this extra
patch, instead of simply reverting the patch introduced in the last
upload. I'll leave the final word to the systemd maintainers, of course.


Cheers,
-- 
Cyril Brulebois (kibi at debian.org)            <https://debamax.com/>
D-I release manager -- Release team member -- Freelance Consultant
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