2013/4/30 Jason Cipriani <[email protected]> > I am currently working on a project where 60 devices, all behind a router > with one WAN IP, update their time from north-america.pool.ntp.org on > boot. They all boot at the same time. > > I frequently run into rate limit errors. > > I am going to add a small random delay to the initial NTP update to spread > out the requests a bit. What is the actual rate limit? > > Thanks, > Jason >
I would suggest two possible solutions: 1. If you setup the devices to use an external DNS server, they should hopefully get different IP addresses, so they use different NTP servers, avoiding most rate limits. 2. (the "correct" way) Your router or any other host behind your router should be able to run an NTP daemon. This one updates via the pool, all the other 60 devices use this NTP server. This also means a more accurate time sync between your devices because of the low latency in your local LAN. If you don't have any device or server that is able to do this, you could use a cheap linux box based on Cubieboard, Beaglebone, Raspberry Pi, etc., starting from $ 35 plus SD card, needs no more than USB Power and a network connection.
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