Hi Tore,

There are only 8 countries with more than 20 IPv6 servers and 17 with more than 
10. For IPv4 the numbers are 21 and 35. The load sharing system works much much 
better with more servers. Maybe there are enough IPv6 servers, but just 
focusing on the percentage of users vs the percentage of servers doesn’t 
necessarily cover the trade-offs.

The other (maybe bigger) issue is that the client support for IPv6 is, to me, 
uncertain. At a minimum I want to have an option for the vendor zones so they 
can enable and disable IPv6 as needed if they know their clients don’t do the 
right thing (whatever that is — as was pointed out in the thread here even ntpd 
isn’t obviously doing the right thing).

As mentioned in another thread I’m planning to change how the various zone 
names work to better support countries with few servers. When I’ve added the 
vendor zone options I might also enable more of the sub-zones for IPv6 at that 
point.

If you want IPv6 for your ntpd instance, just use “pool 2.pool.ntp.org” as the 
configuration now. On ntpd 4.2.6p5 it will add both the IPv4 and IPv6 servers 
(so about doubling the load on the servers, in that instance anyway).


Ask
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