Danny, Maybe I'm dreaming awake, but I have a distinct memory that at least one DNS reply did have multiple addresses, but that the order was randomized on every reply. I was told that the NTP code used only the first one. A quick check in ntp_config.c shows a pool argument to the server command, but I haven't checked further to see what it does. The code is very mangled and with few comments.
Dave Danny Mayer wrote: > Dave, > > See my comments below. > > David L. Mills wrote: > >>Henk, >> >>Mitigation code is already in the daemon, but it is really useful only >>for the manycast scheme. There is even a new pool command, but I haven't >>checked it out. >> >>There is a mysterious server option you might not know about called >>preempt. Very crudely, at least now, configure say ten pool members and >>specify this option on the server command lines. What should happen is >>that all ten will be mobilized and the usual pruning process will select >>several of the best. A system of timers is used to manage the >>population at a selected level. > > > To do that requires that we keep more than one IP address returned by > the DNS. That doesn't happen today. I'm just about to start work on > fixing that and I will need your advice later on when we get to the > point that we have them in a data structure. > > >>Don't take this seriously just yet. While it's running now with >>manycast, and relatively short timers, to make it work properly with the >>pool, it needs an asynchronous resolver or at least a way to call the >>resolver during regulat operation. > > > We will be able to do this but the asynch resolver is still an issue > that we have not resolved. > > >>Sachim was working on these issues and was to make a candidate list from >>the all the poolsters in the DNS reply, not just the first one. The >>paint is still wet. There are more refined ways to skin the cat, but >>having said that, the cat perched next to me is giving a very strange look. >> > > > Yes, but this is not simple and I don't think Sachim got this started. > > Danny > > >>Dave _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
