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Re: IPv6 default route flapping

Joerg Sonnenberger <> writes:

> On Wed, Apr 21, 2021 at 12:54:36AM +0700, Robert Elz wrote:
>> It seems as if what is happening, is that the router is sending RA's with
>> the source-link addr option, which isn't being added to the neighbour
>> cache.
>> Then NetBSD is doing a NS to discover the address it ignored from the RA,
>> but instead of replying with a ND as would perhaps be expected, the router
>> is simply sending another RA (containing the relevant addr info, which would
>> answer the NS if processed).
> I'm not entirely sure that the behavior of sending a RA as "answer" to a
> NS is valid under RFC 4861

Agreed.   Not sending a ND reply to an ND query is obviously highly
irregular, even if it turns out to be allowed.

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