dhclient cause up/down cycle after 239356 ?
John Baldwin
jhb at freebsd.org
Thu Aug 23 14:27:48 UTC 2012
On Wednesday, August 22, 2012 9:35:34 pm Peter Jeremy wrote:
> On 2012-Aug-22 15:35:01 -0400, John Baldwin <jhb at freebsd.org> wrote:
> >Hmm. Perhaps we could use a debouncer to ignore "short" link flaps? Kind of
> >gross (and OpenBSD doesn't do this). For now this change basically ignores
> >link up events if they occur with 5 seconds of the link down event. The 5 is
> >hardcoded which is kind of yuck.
>
> I'm also a bit concerned about this for similar reasons to adrian at .
> We need to distinguish between short link outages caused by (eg) a
> switch admin reconfiguring the switch (which needs the lease to be
> re-checked) and those caused by broken NICs which report link status
> changes when they are touched. Maybe an alternative is to just ignore
> link flaps when they occur within a few seconds of a script_go().
> (And/or make the ignore timeout configurable).
>
> Apart from fxp(4), does anyone know how many NICs are similarly
> broken?
>
> Does anyone know why this issue doesn't bite OpenBSD? Does it have
> a work-around to avoid resetting the link, not report link status
> changes or just no-one has noticed the issue?
To be clear, I don't like this hack. If there is a way to fix this in
the driver (e.g. not report the link state changes during a reset) that
would be far preferable.
--
John Baldwin
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