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Re: IPv6 default route flapping
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
> 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, but I also don't understand why the existing
code (nd6_rtr_cache) doesn't cover this. That would be a good place to
> I'd suggest putting RA processing back into the kernel to avoid this kind
> of issue.
Except of course that it introduces back all the reasons for why it was
removed in first place and ignores that it shouldn't happen.
> I have another reason for wanting that ... I run a reasonably current HEAD
> kernel (9.99.80 from mid Feb at the minute, though I can upgrade that as
> soon as there's a reason) but a fairly old userland (8.99.12 from late Jan,
> Upgrading the kernel without upgrading userland is supposed to be supported.
Are you really arguing that non-essential functionality should be kept
in the kernel just because it was once present? That doesn't strike me
as very useful at all...
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