Re: NTP over multicast sat link with no return channel

<juliansomers@xxxxxxxxxxxxxx> wrote in message
news:1144334186.210707.143300@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
[...]
In my dreams, I am able to set the clocks with a multicast time signal
over the one-way DVB channel, which is available at all times.

As far as I can tell, I can't use ntpd for this, as it won't work
unless there can be a two-way conversation between client and server. I
hope I am mistaken.

I think you are. Broadcast associations are normally only mobilised
after a return "volley" to determine latency, but this can be
suppressed with the "novolley" option in the configuration file
(probably on the "server" line). Read the docs.

Groetjes,
Maarten Wiltink


.

Relevant Pages

  • Re: NTPD concurrent clients limit
    ... I use my own Symmetricom gps disciplined ntp servers, my own Datum/Symmetricom gps disciplined rubidium standards for 1PPP and 10 MHz all using HP/Symmetricom gps antennas and gps splitters. ... I also run the latest release of ntpd software on several HP/Compaq Servers. ... Is this packet also implemented in a "canned" or hardware only ntp server? ... NTP is designed to work with poll intervals between 64 seconds and 1024 ...
    (comp.protocols.time.ntp)
  • Re: NTP broken with 2.6.14
    ... so network wise you seem to be communicating with the server ... > drifting too severely from the NTP server for ntpd to compensate. ... I rebooted the machine with the 2.6.14 kernel and watched the ... the kernel 2.6.8 on the same hardware. ...
    (Linux-Kernel)
  • Re: NTPD concurrent clients limit
    ... written by someone whose knowledge of ntp was gained in kindergarten class." ... I also run the latest release of ntpd software ... I'm testing an embedded linux device, which implement an NTP server, ... NTP is designed to work with poll intervals between 64 seconds and 1024 ...
    (comp.protocols.time.ntp)
  • Re: NTPD concurrent clients limit
    ... After some discussion with my friends here, a further defense was implemented with result the KoD time returned reveals no influence of the server. ... After learning of this "kod" packet and since these servers vend time to my applications, I would prefer or need the correct time even if something went haywire banging the fool out of a server. ... I have read articles about ntp abuse like that series of cheap routers that had an ip embedded in the firmware that was banging I believe the ucar.edu ntp servers. ... Considering how adaptive the ntpd software has to be, I'm sure it's a delicate balancing act to make it serve the whole of the time community. ...
    (comp.protocols.time.ntp)
  • Re: NTPD concurrent clients limit
    ... See the papers referenced on the NTP project page. ... The most interesting case was finding the abusers in a flood of 3000 packets per second with three load-balanced servers. ... I'm testing an embedded linux device, which implement an NTP server, ... based on the ntpd demon. ...
    (comp.protocols.time.ntp)