dar8...@eml.cc <dar8...@eml.cc> wrote:
> hi,
>
> i'm running ntp-4.2.6p5-3.10.1.x86_64 on linux/64.
>
> i've a question about proper configuration/use of fallback on a roaming
> laptop.
>
> the laptop boots to a no-network configuration.  connection is
> chosen/enabled as needed after KDE desktop launch ...
>
> i'd like to configure ntpd.conf so that
>
> (1) at machine boot, ntp starts up using the machine's local time, in
> the absence of network access.  i think i'd use this:
>
>       server 127.127.1.0
>       fudge 127.127.1.0 stratum 10

Useless!!  Remove it.
This config is not useful when your machine is not a time server for
other machines in the network.

> (2) once network connection is made, if my IP is on my local LAN
> (10.10.50.0/24), then use my local LAN's time server.  for that,
>
>       server   ntp-server-f.q.d.n  iburst prefer
>       restrict ntp-server-f.q.d.n
>
> (3) if my IP is not on my LANB, then use some external servers.  e.g.,
>
>       server clock.isc.org             iburst prefer
>       restrict clock.isc.org
>
>       server ntp1.sf-bay.org           iburst
>       restrict ntp1.sf-bay.org
>
>
> i'm not sure if/how to implement this conditional fallback 'logic' for
> ntp's server selection.

Just put all three servers in the config and NTP will use them
automatically.

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