Re: bin/55973: ntpd(8) does not notice all interface changes any more

[Frank Kardel <kardel%kardel.name@localhost>]

Looks like it is behaving as expected.

XFAC just means interfaces have changed in between - should recover at 
next poll.

INIT means that ntpd has not yet seen a reply packet (possibly not even 
requested one

up to now.

Keep in mind the ntpd polls at its normal rate and needs at least 4 
replys before considering

tracking the time on a peer. So if interfaces come up after ntpd attempts to

query peers we basically miss the first 64 second poll interval.

A closer look is needed whether it is unfortunate timing.

Frank


On 02/04/21 17:55, Roy Marples wrote:
> The following reply was made to PR bin/55973; it has been noted by GNATS.
>
> From: Roy Marples <roy%marples.name@localhost>
> To: Frank Kardel <kardel%kardel.name@localhost>, gnats-bugs%netbsd.org@localhost,
>   gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost, roy%NetBSD.org@localhost
> Cc:
> Subject: Re: bin/55973: ntpd(8) does not notice all interface changes any more
> Date: Thu, 4 Feb 2021 16:54:21 +0000
>
>   Hi Frank
>   
>   On 04/02/2021 10:59, Frank Kardel wrote:
>   > seems like one of the last routing socket optimizations have gone
>   >
>   > unintendedly too far. Roy, could you please check?
>   
>   So on my pinebook with ntpd dated Jan 1 this year (ie before my latest changes)
>   I see the same / similar behaviour as on my dev machine with the latest code.
>   
>   I start ntpd without any interface other than lo0 on my pinebook and have netbsd
>   pool ntp servers setup.
>   
>   I hotplug urtwn0 and after the address as left the tentative state, ntpq -pn
>   shows remote's appear but in the .INIT. state.
>   After 5 minutes waiting only one of these has left the .INIT. state and now has
>   a refid.
>   
>   I can restart ntpd a few times and eventually some or all leave the .INIT. state.
>   
>   I unplug urtwn0, ntpq reports no ids and plug it back in.
>   ntpd sees the address leave tentative and voila ids come back.
>   two have refids, one is in .INIT. and one is in .XFAC.
>   
>   I have no idea what this means, but I suggest things are working?
>   
>   Roy
>