The end of the beginning is in sight

[Hal Murray]

[extension fields]
> That sounds uncomfortably plausible.  I can think of a workaround: add a
> padding extension long enough that the packet can't have any of the magic
> lengths. 

Here is the RFC on that area.

Network Time Protocol Version 4 (NTPv4) Extension Fields
March 2016
https://tools.ietf.org/html/rfc7822



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