Hi,

On Thu, 2019-02-14 at 07:01 -0500, Brian J. Murrell wrote:
> On Thu, 2019-02-14 at 07:49 +0100, Thomas Haller via networkmanager-
> 
> > It's not clear to me what you mean.
> > 
> > Do you mean, that the many RA received at NetworkManager cause
> > NetworkManager to send too frequent RS (in turn, repeating a
> > vicious
> > cycle)?
> 
> That's exactly how I understand the description from the author of
> the
> software on the router that is sending the RAs, yes:
> 
> https://github.com/openwrt/odhcpd/issues/122#issuecomment-459263681

OK, makes sense.


> > Also, NM only sends RS based on timeouts, not based on RAs that it
> > receives [1].
> 
> Assuming no bugs, of course.  Such as could the receiving of the
> multiple RAs perhaps be causing the timeout to get reset, etc.?
> 
> How/when does the logging in send_rs_timeout:
> 
> https://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/src/ndisc/nm-ndisc.c?id=2c881b8064e1cb5b227e5a3c61abfe95c6ddd05a#n711
> 
> supposed to get logged?

In 1.10.2-16.el7_5, that code looks pretty similar. NetworkManager
should either log

    "router solicitation sent"

or

    "failure sending router solicitation: ...

for every RS that gets send.


Possibly the logging message was suppressed by journald's ratelimiting
(as the journal would tell you, if that's the case). Make sure to
disable rate-limiting, see [1].


[1] 
https://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/contrib/fedora/rpm/NetworkManager.conf#n28


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