i am working for a ISP in China, and i have many friends in other ISPs. it's easy to hosting dozes of NTP servers which have good time reference. i have made two raspberrypi with GPS module under $60, and i will write a Chinese version blog to explain how to do it.
we have several public ntp servers (Stratum 2) referencing raspberry PI(Stratum 1). the problem is high packet loss from US monitor node to China, so ntp server will not work most time for low scores. packet loss rate for UDP 123 is much higher than other packet such as ICMP, for the UDP 123 is abused by NTP Refelection DDOS Attack. i know there are such DDOS attacks every day, some of them more than 200Gbps. > On Jun 8, 2016, at 23:58, Rob Janssen <[email protected]> wrote: > > Dan Drown wrote: >> >> While having more sources in China is nice, that doesn't help the problem >> that monitoring external to China sees packet loss and will likely continue >> to see packet loss. This thread started with a volunteer NTP server having >> a lower score in the NTP pool than it should. Any other sources inside >> China can't be used as efficiently because of this. > > Ah I got the impression that there was packetloss because there was a vast > number of clients, and that the poster believed that other pool members > had left the pool because of the high query rate. So a higher number of pool > servers might bring down the query rate sufficiently to solve the > packet loss problem. > > > "An important characteristic of the Chinese internet is that online access > > routes are owned by the PRC government, and private enterprises and > > individuals can only rent bandwidth from the state." > > I don't think the Chinese internet is that bad and/or that this would be > related to equipment being owned by the government. > Enough traffic gets in here from China to let me believe that they apparently > have quite some capacity there. > (which they are usually not using to communicate about abuse) > > Rob > _______________________________________________ > pool mailing list > [email protected] > http://lists.ntp.org/listinfo/pool > _______________________________________________ pool mailing list [email protected] http://lists.ntp.org/listinfo/pool
