In <[EMAIL PROTECTED]> Ask Bjørn Hansen <[EMAIL PROTECTED]> writes:
> On Aug 24, 2005, at 11:05 PM, wayne wrote: > >> These spikes appear to be caused by some kind of client that does a >> DNS lookup before each query. > > It'll be cached by their local nameserver. The TTL on the pool.ntp.org A records is only 1500 seconds. If these clients are querying only once ever 1024 seconds or so, then you will generally only get 1.5 ntp requests per DNS lookup. If they are scripts that checks ntpdate, they could very easily query less often, say, once per hour. >> This really concerns me because the size of the DNS lookup is >> actually significantly larger than the size >> of the NTP packets and we are going to have a *much* harder time >> distributing the load on the name servers. > > This is not true. I'm not sure which part you don't think is true. The size of the ntp requests is only 76 bytes, while the DNS lookups are over 400. I don't see how we can easily distribute the load on the name servers. -wayne _______________________________________________ timekeepers mailing list [email protected] https://fortytwo.ch/mailman/cgi-bin/listinfo/timekeepers
