Re: [chrony-users] Query regarding "Broadcasting of NTP packets on LAN"

[Bill Unruh <unruh@xxxxxxxxxxxxxx>]

On Thu, 15 Aug 2013, Ajay Garg wrote:

> On Thu, Aug 15, 2013 at 7:24 PM, Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:
>
> > On Thu, 15 Aug 2013, Ajay Garg wrote:
> >
> >  Hi all.
> > > First, let's me detail the use-case :)
> > >
> > >
> > >
> > > ## USE CASE BEGINNING ##
> > >
> > > We have a server, S1, which has two interfaces, I1 and I2.
> > > I1 is the gateway to the internet, while I2 is exposed to a LAN.
> > >
> > > Thus, installing "chrony" on S1, and then starting "chronyd" works like a
> > > charm on S1.
> > >
> > >
> > > Now, clients C1, C2, .... Cn are computers, connected via LAN.
> > > Thus, all of C1, C2, ..... Cn can communicate with S1, but cannot
> > > communicate to the internet.
> > >
> > >
> > >
> > > It is desired for C1, C2, ... Cn to synchronise their times, using S1 as
> > > their "time server".
> > >
> > >
> > > ## END OF USE CASE ##
> > >
> > >
> > >
> > > I noted http://chrony.tuxfamily.org/**FAQ.html#question_12.2<http://chrony.tuxfamily.org/FAQ.html#question_12.2>,
> > > which implies
> > > that the above use-case might indeed be possible to be solved.
> > > However, I could not find any details in the FAQ.
> >
> > Set up C1's internal IP address as the server for the other machines.
>
>
> You meant "S1's internal IP address", right? :)

Yes. I thought I had changed all the C1 to S1 (I originally composed the reply
with C1 the server)


> > Make
> > sure that on C1 those IP addresses of the internal lan  are allowed as
> > clients.
>
> Again, you meant "Make sure that on S1" right? :)

Yes.

> > > Any starting points? :)
> >
> > in chrony.conf of the toher machines
> > server 192.168.0.2
> >  and on S1
> > allow 192.168
>
> Should it be
>                            allow 192.168

According to chrony.txt it should be this one.
But try it. If it does not work, try your suggestion.


> or
>                            allow 192.168/16
>
> ?
>
>
>
> > (assuming that the internal subnet is 192.16.x.x and that S1's address on
> > theinternal subnet is 192.169.0.2)
> >
> > Read /usr/share/doc/chrony/chrony.txt
>
>
> Thanks again !!!
> (Right now, I have not got it working, but I haven't read
> "/usr/share/doc/chrony/chrony.txt" too :P
>
>
>
> >  I will be really grateful :)
> > > Thanks and Regards,
> > > Ajay
> > --
> > William G. Unruh   |  Canadian Institute for|     Tel: +1(604)822-3273
> > Physics&Astronomy  |     Advanced Research  |     Fax: +1(604)822-5324
> > UBC, Vancouver,BC  |   Program in Cosmology |     unruh@xxxxxxxxxxxxxx
> > Canada V6T 1Z1     |      and Gravity       |  www.theory.physics.ubc.ca/
> >
> > --
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--
William G. Unruh   |  Canadian Institute for|     Tel: +1(604)822-3273
Physics&Astronomy  |     Advanced Research  |     Fax: +1(604)822-5324
UBC, Vancouver,BC  |   Program in Cosmology |     unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1     |      and Gravity       |  www.theory.physics.ubc.ca/

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