Re: Isolated Network Configuration

I think you might have meant to reply to another thread. I was following up
on a response I sent to Miroslav on 01/22.

On Mon, Jan 27, 2025 at 1:38 PM Bill Unruh <[email protected]> wrote:

>
> Local means it gets the time from itself (Ie, it is a totally useless time
> source, and is used if the machine is a time server to other machines and
> must
> be kept running even if its time is off.)
>
> Re the port, It is not clear to me what you are trying to do. Does the port
> directive work if it is the only one.  I do not believe that chrony will
> deliver time to  two separate ports. The ports are incoming (ie tells
> chrony
> to listen to those ports) rather than outgoing AFAIK
>
> William G. Unruh __|__Hagler Fellow, Distinguished |_Tel:UBC
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>
> On Mon, 27 Jan 2025, William Bergen wrote:
>
> > [CAUTION: Non-UBC Email]Any advice to get the orphan mode working? I
> think this might be the option I need but I'm not
> > positive. Alternatively I could delete the local directive on my two
> servers but I don't think that's quite right either
> > since none of the other clients/servers would select a source if both
> GPS are offline.
> >
> > On Wed, Jan 22, 2025 at 9:53 AM William Bergen <[email protected]>
> wrote:
> >       > In SC06 there is "GPS A & B disagree" and "GPS B is inactive".
> How can
> >       > they disagree when only one is working?
> >
> > Ah my apologies, I made a mistake with the table. SC06 has both GPS
> sources active but their measurements
> > disagree. This is an edge case but it has happened in practice.
> >
> > > Is the server trying to poll itself? What is that supposed to do?
> >
> > I had this in there hoping that it would help Server A resolve its local
> refid in orphan mode. It doesn't seem to
> > have helped. It was my understanding that chrony will ignore servers
> that resolve to the localhost. I will remove
> > those lines if they are useless.
> >
> > > Which scenarios break when you don't use any of the trust options?
> >
> > Without the trust options in place, I'm unable to meet SC06 since the
> clients won't select a server, Server B will
> > select GPS B as its source.
> >
> > > That indicates chronyd doesn't know the local IP address for the orhan
> > > source. Is it running on normal Linux? Can you check strace if
> > > received messages have the IP_PKTINFO cmsg?
> >
> > The server computers are raspberry pi 4s running raspbian buster. Chrony
> version info:
> > ```
> > $ chronyd -v
> > chronyd (chrony) version 3.4 (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP
> +SCFILTER +SIGND +ASYNCDNS +SECHASH +IPV6
> > -DEBUG)
> > ```
> > I am seeing some syscalls to `recvmmsg` with the IP_PKTINFO cmsg type.
> >
> >
> >
> > On Wed, Jan 22, 2025 at 3:43 AM Miroslav Lichvar <[email protected]>
> wrote:
> >       On Tue, Jan 21, 2025 at 04:28:00PM -0500, William Bergen wrote:
> >       > I’ve been spending quite a bit of time trying to configure the
> system to
> >       > meet my needs but I can’t seem to satisfy every scenario
> simultaneously. I
> >       > know this is complicated by the fact that there are only 2
> servers in the
> >       > network. I’ve tried to compile my requirements into a table of
> scenarios
> >       > and desired outcomes.
> >       > [image: scenarios.png]
> >
> >       In SC06 there is "GPS A & B disagree" and "GPS B is inactive". How
> can
> >       they disagree when only one is working?
> >
> >       > So far, my biggest trouble has been meeting SC04 AND SC06 with
> the same
> >       > configuration. This is where I’m at right now with the relevant
> sections of
> >       > the configuration:
> >       > Server A
> >       >
> >       > rtcsyncallow 192.168.5
> >       > local stratum 10 orphan
> >       > makestep 1 -1
> >       > refclock SHM 0 refid GPS delay 0.2 trust
> >       > server 192.168.5.1
> >
> >       Is the server trying to poll itself? What is that supposed to do?
> >
> >       Which scenarios break when you don't use any of the trust options?
> >
> >       > This config setup is the closest I have gotten to achieving my
> desired
> >       > outcomes. I thought that the orphan option for the local
> refclock was
> >       > correct in this scenario but I keep receiving an error when
> testing
> >       > SC05: Unknown
> >       > local refid in orphan mode.
> >
> >       That indicates chronyd doesn't know the local IP address for the
> orhan
> >       source. Is it running on normal Linux? Can you check strace if
> >       received messages have the IP_PKTINFO cmsg?
> >
> >       --
> >       Miroslav Lichvar
> >
> >
> >       --
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> >
> >