[ntp:questions] NTP Pool Server Costs me $40/mo in Bandwidth--is there a suggested way to rate-limit?

brian.cunnie at gmail.com brian.cunnie at gmail.com
Sat Jun 14 18:59:41 UTC 2014


Hi All,

Is there a suggested way to rate-limit queries by broken clients?

Running an NTP Pool Server costs me $40/month in Amazon AWS Outbound Bandwidth (if you want the full scoop, read here: http://pivotallabs.com/ntp-server-costing-500year/ ).

I suspect that broken NTP clients are part of the problem (for example, 2 IP addresses in Puerto Rico query my server on the average 11.5 times per second--eliminating just those 2 would save me almost $1/month).

Are there any other techniques people have found to be helpful?  I like running a server for the NTP Pool, I just don't want to spend a lot of money doing it.

Thanks,

--Brian

p.s. No, my server isn't being used in a reflection attack:  monlist is disabled, and the NTP traffic load is symmetric.



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