Mention dynamic allocation of NTP servers on Network requirements docs

[jellyfish-bot]

[vipulgupta2048] NTP / UDP packets (port 123) are exchanged with:

0.resinio.pool.ntp.org
1.resinio.pool.ntp.org
2.resinio.pool.ntp.org
3.resinio.pool.ntp.org

We should mention that the resinio.pool.ntp.org is a pool dynamically allocated NTP servers so when opening UDP port 123 they cannot restrict it to one domain.

[jellyfish-bot]

[vipulgupta2048] This issue has attached support thread https://jel.ly.fish/714118fd-2af4-4b00-9fe2-5211bf724cb4

[vipulgupta2048]

We should mention that the resinio.pool.ntp.org is a pool dynamically allocated NTP servers so when opening UDP port 123 they cannot restrict it to one domain.

Hey @cmfcruz or @ab77 Can you folks confirm this statement and if yes, can we add this to the documentation. If they is not a exhaustive list I think we could change this to provide more accurate information. Let me know.

[ab77]

resinio.pool.ntp.org doesn't resolve to anything for me @vipulgupta2048, so you may want to check with the OS team.

[klutchell]

We should mention that the resinio.pool.ntp.org is a pool dynamically allocated NTP servers so when opening UDP port 123 they cannot restrict it to one domain.

As @ab77 said, resinio.pool.ntp.org does not resolve to anything, but *.resinio.pool.ntp.org cannot be pinned to specific addresses if that's what you mean?

$nslookup resinio.pool.ntp.org                     
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
*** Can't find resinio.pool.ntp.org: No answer

$ nslookup 0.resinio.pool.ntp.org
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
Name:	0.resinio.pool.ntp.org
Address: 172.105.3.84
Name:	0.resinio.pool.ntp.org
Address: 192.95.27.155
Name:	0.resinio.pool.ntp.org
Address: 159.203.8.72
Name:	0.resinio.pool.ntp.org
Address: 206.108.0.131

$ nslookup 1.resinio.pool.ntp.org
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
Name:	1.resinio.pool.ntp.org
Address: 216.197.228.230
Name:	1.resinio.pool.ntp.org
Address: 209.115.181.110
Name:	1.resinio.pool.ntp.org
Address: 209.115.181.108
Name:	1.resinio.pool.ntp.org
Address: 217.180.209.214

etc