Created attachment 234042 [details]
Patch for usr.sbin/ntp/ntpd/ntp.conf replacing 0.freebsd.pool.ntp.org with 2.freebsd.pool.ntp.org

The current default pool is `0.freebsd.pool.ntp.org` which is an IPv4-only service. The `0.*`, `1.*`, and `3.*` pools are IPv4-only.

The `2.*` pool supports both IPv4 and IPv6. This behavior can be verified with `host`:

```
% host 0.freebsd.pool.ntp.org
0.freebsd.pool.ntp.org has address 185.216.231.116
0.freebsd.pool.ntp.org has address 74.6.168.72
0.freebsd.pool.ntp.org has address 129.250.35.250
0.freebsd.pool.ntp.org has address 216.229.0.50
% host 2.freebsd.pool.ntp.org
2.freebsd.pool.ntp.org has address 104.156.229.103
2.freebsd.pool.ntp.org has address 50.205.244.37
2.freebsd.pool.ntp.org has address 162.248.241.94
2.freebsd.pool.ntp.org has address 65.108.70.240
2.freebsd.pool.ntp.org has IPv6 address 2001:19f0:b400:182d::123
2.freebsd.pool.ntp.org has IPv6 address 2001:418:3ff::53
2.freebsd.pool.ntp.org has IPv6 address 2607:f8f8:721:e301::123
2.freebsd.pool.ntp.org has IPv6 address 2001:470:1f0f:3e0:c352:4a66:89c8:f9b9
```

Hopefully this patch will save a few others running an IPv6-only server an hour of investigating why `ntpd` isn't working.