[email protected] <[email protected]> wrote: > Hi All, > > Is there a suggested way to rate-limit queries by broken clients?
There isn't any. In fact, many methods to do that are likely to make the problem worse. For example, people suggest to limit the number of queries answered or even to send KOD packets. However, broken clients don't implement KOD and think they just got a damaged answer that they can fix by asking again. And when they don't get an answer on their query they often re-try. The re-try interval may be even shorter than the usual interval between polls. There is really nothing you can do from the serverside to affect the upstream bandwidth usage by clients. When you have to pay for traffic and you cannot afford it, the best solution is to go out of the pool. (and even that will not help immediately, as client software often does a DNS lookup at startup and then keeps using the same IP address until restarted. you will see gradually decreasing traffic, but there may be clients that are still there after a year or more) _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
