Good morning:

I have now experimentally enabled IPv6 connectivity for my network and added my 
Stratum 1 NTP server (a Symmetricom S200 with rubidium oscillator & GPS 
reference) with the new IPv6 address in addition to the current IPv4 address. 
However, I noticed that the clock error shown in the statistics is 
significantly larger for the IPv6 address:

IPv4: 96.237.191.14
IPv6: 2620:fc:8000::200

As you can see in the charts, the clock error for IPv4 is typically showing as 
less than +/- 5ms with only few occasional spikes into the +/- 10ms band due to 
network latencies. By contrast, the IPv6 statistics seem to have a biased 
offset of -30ms and fluctuate at that level.

However, since it is the same physical machine and a Stratum 1 server I know 
for a fact that it is accurate. Is this an IPv6 networking issue with routing 
or latencies? Or is the monitoring server for IPv6 working differently?

Best regards,
 
Alexander Falk
www.xmlaficionado.com
twitter.com/afalk
 
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