On 2009-12-03, [email protected] <[email protected]> wrote: > I'll try to explain why I do not think that covers it. > > In my case, the prefer peer (ntp1) is unreachable. > Even if it were never discarded (I assume that's what the immunity > idol means), my host1 and host2 should not use each other as > synchronization source.
Apparently ntp has a command option called noselect, which tells ntp never to select that host as a source. It is useful for using A to keep track of B by periodically sending B packets to see what B's time is,but never to use it as a source. It sounds like that is what you want. (I have heard this as a rumour in a chrony discussion, so will have to let you look up the details-- sorry) > >> Mitigation Rules >> "As the selection algorithm scans the associations for selectable >> ? ?candidates, the modem driver and local driver are segregated >> ? ?for later, but only if not designated a prefer peer. ?If so >> ? ?designated, a driver is included among the candidate population." > > Problem is, my prefer peer (to host1/host2) is neither a modem nor > local driver. > It is a genuine external source. > >> "If the prefer peer is among the survivors, it becomes the system >> ? ?peer and its clock offset and jitter are inherited by the >> ? ?corresponding system variables. Otherwise, the combining >> ? ?algorithm computes these variables from the survivor population." > > The prefer peer indeed remains the synchronisation source, despite > being unreachable (!). > This is what I find buggy. > >> The minsane Option >> "The minclock threshold > > Thanks, didn't use these options before. Maybe they will become handy > at some time, but as far as I can see they will not mitigate my > immediate problem. If I cut the LANs, I expect to have no survivors. > Shouldn't my preferred peers have been eliminated as unfit due to no > reachability in ntp_proto.c:peer_unfit() (TEST13) ? _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
