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SNTP is a less complex and less precise implementation of the NTP protocol.

It uses Port-123-udp like NTP, but only supports a single time server and its algorithm requires less ressources.
It was designed for embedded systems which do not require the full precision of the NTP protocol.

The RFC links above point to the SNTPv4 spec (obsolete) and the current NTPv4 spec, which also covers SNTP.


In early FRITZ!OS only SNTP was supported, implemented in multid.
Since fw 4.63 NTP is supported by chronyd, which is controlled by multid using chronyc.
In fw 7.39 AVM added avmntpd, a SNTP client to quickly get a valid system time before chronyd takes over.


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