On Mon, Apr 18, 2016 at 10:14:20AM +0200, Rob Janssen wrote: > Miroslav Lichvar wrote: > >Yes, it seems request to the NIST servers have an extra 60 ms delay, > >which makes them appear to run 30 ms ahead of UTC. > > > >In my logs it started approximately in October last year and it wasn't a > >sudden switch, but rather a slowly increasing percentage of requests > >getting this delay, which got close to 100% by the end of the year. > > > > Maybe they are overloaded?
Could that create a constant delay? If the network or the servers were overloaded, I'd expect the extra delay to be randomly distributed across some range. From the (limited) data I have it looks like the distribution of the delay just shifted by ~63 milliseconds, there is nothing in between. It would be interesting to see a traceroute to the servers, or at least see if the delay affects also ICMP packets, but they are being dropped somewhere on the path. BTW, there was a very interesting report published recently about the NIST NTP servers. http://nvlpubs.nist.gov/nistpubs/jres/121/jres.121.003.pdf -- Miroslav Lichvar _______________________________________________ pool mailing list [email protected] http://lists.ntp.org/listinfo/pool
