Jan Ceuleers wrote: > All, > > One of my favourite articles on the interweb is the following (about the > Netgear/UWisc debacle). > > http://www.cs.wisc.edu/~plonka/netgear-sntp > > In the list of best practice recommendations it makes about SNTP > implementations, it says: > > "SHOULD resolve the server IP address via DNS before each poll/query, so > that the pertinent DNS entries' Time-To-Live values are respected." > > I was wondering whether the readership of this forum feels that this > should also apply to NTP implementations. > > Cheers, Jan
I'll vote a definite NO! An SNTP client might query five or six times a day! An NTP client will query as frequently as once per minute and doing a DNS lookup each time would border on the absurd. IP addresses do not change all that often and a system that did change IP addresses frequently would not be much use as an NTP server. If an IP address stops responding to NTP queries, it would be reasonable to query DNS again. Once! If you get the same IP address again, the server must be presumed down. _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
