[dns-operations] Limit on Name Servers & their IPs for a sub-domain

[Stephane Bortzmeyer]

On Thu, Jan 11, 2018 at 05:32:40PM -0700,
 Brett Watson <brett at the-watsons.org> wrote 
 a message of 66 lines which said:

> > If we ever get to the state where the roots are IPv6 only, 11 servers will fit.
> 
> First I’ve seen anyone do the math on this, and wondering did anyone
> think of this and what’s the impact if in fact some day roots are v6
> only?

The Yeti root is IPv6-only and it just works. See
<https://yeti-dns.org/>


% check-soa .
3f79bb7b435b05321651daefd374cd.yeti-dns.net.
	2401:c900:1401:3b:c::6: OK: 2018011200
bii.dns-lab.net.
	240c:f:1:22::6: OK: 2018011200
ca978112ca1bbdcafac231b39a23dc.yeti-dns.net.
	2c0f:f530::6: OK: 2018011200
dahu1.yeti.eu.org.
	2001:4b98:dc2:45:216:3eff:fe4b:8c5b: OK: 2018011200
dahu2.yeti.eu.org.
	2001:67c:217c:6::2: OK: 2018011200
ns-yeti.bondis.org.
	2a02:2810:0:405::250: OK: 2018011200
xn--r2bi1c.xn--h2bv6c0a.xn--h2brj9c.
	2001:e30:1c1e:10::333: OK: 2018011200
yeti-dns01.dnsworkshop.org.
	2a03:4000:5:2c3::53: ERROR: read udp [2001:67c:1348:7::86:133]:54218->[2a03:4000:5:2c3::53]:53: i/o timeout
yeti-dns02.dnsworkshop.org.
	2001:19f0:0:1133::53: OK: 2018011200
yeti-ns.as59715.net.
	2a02:cdc5:9715:0:185:5:203:53: OK: 2018011200
yeti-ns.datev.net.
	2a00:e50:f155:e::1:53: OK: 2018011200
yeti-ns.ix.ru.
	2001:6d0:6d06::53: OK: 2018011200
yeti-ns.lab.nic.cl.
	2001:1398:1:21::8001: OK: 2018011200
yeti-ns.switch.ch.
	2001:620:0:ff::29: OK: 2018011200
yeti-ns.tisf.net.
	2001:4f8:3:1006::1:4: OK: 2018011200
yeti-ns.wide.ad.jp.
	2001:200:1d9::35: OK: 2018011200
yeti-ns1.dns-lab.net.
	2001:da8:a3:a027::6: OK: 2018011200
yeti-ns2.dns-lab.net.
	2001:da8:268:4200::6: OK: 2018011200
yeti-ns3.dns-lab.net.
	2400:a980:30ff::6: OK: 2018011200
yeti.aquaray.com.
	2a02:ec0:200::1: OK: 2018011200
yeti.bofh.priv.at.
	2a01:4f8:161:6106:1::10: OK: 2018011200
yeti.ipv6.ernet.in.
	2001:e30:1c1e:1::333: OK: 2018011200
yeti.jhcloos.net.
	2001:19f0:5401:1c3::53: OK: 2018011200
yeti.mind-dns.nl.
	2a02:990:100:b01::53:0: OK: 2018011200
yeti1.ipv6.ernet.in.
	2001:e30:187d::333: OK: 2018011200