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com:network_protocols [2025/04/28 13:03] – created vamsancom:network_protocols [2025/04/28 13:13] (current) – [NTP / SNTP] vamsan
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 ====== Network protocols ====== ====== Network protocols ======
 +This page presents the protocols used in automation and, where appropriate, compares them.
 ===== NTP / SNTP ===== ===== NTP / SNTP =====
 SNTP (//Simple Network Time Protocol//) and NTP (//Network Time Protocol//) use the same format for data packets transmitted over the network. The main difference lies in how the network packets are evaluated on the client side. SNTP (//Simple Network Time Protocol//) and NTP (//Network Time Protocol//) use the same format for data packets transmitted over the network. The main difference lies in how the network packets are evaluated on the client side.
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 Because of the differences described above, it works well for an SNTP client to retrieve the time from an NTP server. Conversely, however, it doesn't make much sense for an NTP client capable of achieving high accuracy to retrieve the time from an SNTP server that offers only lower time accuracy. Because of the differences described above, it works well for an SNTP client to retrieve the time from an NTP server. Conversely, however, it doesn't make much sense for an NTP client capable of achieving high accuracy to retrieve the time from an SNTP server that offers only lower time accuracy.
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 +  * SNTP protocol definition: [[https://www.rfc-editor.org/rfc/rfc2030.txt|RFC-2030]]
 +  * NTP protocol definition: [[https://www.rfc-editor.org/rfc/rfc1305.txt|RFC-1305]]
 +  * UDP/TIME protocol definition: [[https://www.rfc-editor.org/rfc/rfc868.txt|RFC-868]]