On 2005-10-23, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > 1. Does having 2 broadcast server add to the accuracy of the clients?
s/accuracy/stability/ broadcast clients receive a timestamp every 64 seconds from each server unicast clients poll each server every 64 to 1024 seconds Operating in broadcastclient mode may improve your clock stability by reducing the amount of time between "polls". > 2. I tried to have on the client in addition to the "broadcastclient" > directive the "server" and "fudge" directives for local synchronization > in case there is a network outage (slim chance, but none the less) and > it didn't work. Why? Do you mean you used: server 127.127.1.0 fudge 127.127.1.0 stratum NN Please keep in mind that it will take as much as 8 minutes before ntpd will consider the undisciplined local clock (127.127.1.x) for synchronization. > 3. I noticed that on the client when I run `ntpq -p` it sees all the > servers on the subnet even though only 2 servers broadcast, and while > only 2 servers are stratum 3 and all the others are on stratum 4, the > broadcast client moved between the servers in stratum 4 ignoring the > broadcast servers in stratum 3. As has been said elsewhere, the broadcastclient / multicastclient modes require the use of NTP Authentication. You can disable the requirement for authenticaton, but doing so allows unauthorized (broadcast) time servers on your LAN to change your clients' clocks. Please see http://ntp.isc.org/Support/ConfiguringAutokey for detailed information about setting up NTP Authentication using Autokey. BTW: It has been pointed out that two upstream time servers is not a good configuration. That is true but is not the reason why broadcastclient mode does not work. The problem with using only two sources of time is that ntpd has no way of deciding which source is correct. You need to use three (some say four), or more, time sources to give ntpd enough input to detect a "false-ticker". -- Steve Kostecke <[EMAIL PROTECTED]> NTP Public Services Project - http://ntp.isc.org/ _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
