NTP
Network Time Protocol
Simple Network Time Protocol (SNTP)
SNTPはNTPの一部を抽出したような感じ?
RFC 5905 Network Time Protocol Version 4: Protocol and Algorithms Specification (NTPv4)
https://github.com/kinformation/rfc5905/blob/master/rfc5905_ja.md
RFC 4330 Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI
RFC 2030 Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI
https://www.akanko.net/marimo/data/rfc/rfc2030-jp.txt
RFC 1769 Simple Network Time Protocol (SNTP) 廃止→ 2030, 4330
RFC 1361 Simple Network Time Protocol (SNTP) 廃止→ 1769
RFC 1305 NTPv3 (廃止) → 5905
RFC 1119 NTPv2 (廃止) → 1305
RFC 1059 Network Time Protocol (Version 1) Specification and Implementation (廃止) → 1305
RFC 958 Network Time Protocol (NTP) (廃止) → 1305
https://www.ntppool.org/ja/use.html
0.jp.pool.ntp.org などを指定する
Windows 11(管理者権限)
$ w32tm /config /syncfromflags:manual /manualpeerlist:"0.jp.pool.ntp.org 1.jp.pool.ntp.org 2.jp.pool.ntp.org 3.jp.pool.ntp.org"
ローカルエリア用にPTPがあるらしい
https://www.ntppool.org/ja/vendors.html