On Mon, Nov 4, 2019, at 5:23 PM Richard Laager via devel <devel@ntpsec.org> wrote:
> Each of these names (N.debian.pool.ntp.org) resolves to only 4 IPs.* The > four of them resolve to (mostly) non-overlapping IPs. In other words, if > I resolve only one name, I get 4 IPs, but if I resolve all four names, I > get 15 IPs. If I wait 150 seconds for the TTL to expire, I do get more > IPs. But using all four names definitely gets me IPs a lot faster, which > makes a difference for initial convergence. > > * I'm ignoring IPv4 vs IPv6 here and considering only one address > family, which is relevant to IPv4-only hosts. Though apparently only one > of the four names is returning AAAA records. > That would be N=2. You only need to wait for the timeout to expire if you are using a caching resolver (you are). If one of the nameservers for the pool is directly asked (you should not) you can get answers faster.
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