[systemd-devel] Systemd-networkd -- Cannot acquire DHCP lease on bridge interface

[Camilo Aguilar]

On Wednesday, October 22, 2014, Lennart Poettering <lennart at poettering.net>
wrote:

> On Wed, 22.10.14 20:49, Tom Gundersen (teg at jklm.no <javascript:;>) wrote:
>
> > On Wed, Oct 22, 2014 at 6:23 PM, Lennart Poettering
> > <lennart at poettering.net <javascript:;>> wrote:
> > > On Wed, 22.10.14 18:16, Tom Gundersen (teg at jklm.no <javascript:;>)
> wrote:
> > >
> > >> Hi guys,
> > >>
> > >> I finally got around to have a look at this. I can reproduce the
> > >> problem, and for me a workaround is to set RequestBroadcast=yes in the
> > >> DHCP section in the .network file for your host0 interface in the
> > >> container. Does that work for you too.
> > >
> > > Hmm, maybe the default .network file we ship for this case should
> > > include this setting? Or will it in turn break the non-bridged veth
> > > setups?
> >
> > Yeah, there is no perfect option. Some networks will filter broadcast
> > messages (though that is arguably even more broken than filtering
> > messed up unicast ones).
>
> Hmm? Not following.
>
> I understood that RequestBroadcast=yes is necessary to make dhcp work
> on the Linux kernel bridge. Or is that a misunderstanding?
>
> What I am wondering about specifically is whether
> 80-container-host0.network shall default to RequestBroadcast=yes, or not?
>
> Aso, if there are some networks that require the bit set, and others
> that require it unset, what about trying the other after not getting a
> reply on the first?


Trying unicast, waiting some time and then trying broadcast, if a
DHCP offer is not sent within that time limit, seems like a fair thing to
do. My 2 cents.


> Lennart
>
> --
> Lennart Poettering, Red Hat
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