[ntp:hackers] Mitigation rules

M. Warner Losh imp at bsdimp.com
Mon Apr 6 17:19:24 UTC 2009


In message: <49DA35A7.7030209 at udel.edu>
            David Mills <mills at udel.edu> writes:
: Guys,
: 
: NASA/JPL has decided to implement the NTP interleaved modes for Mars 
: orbiters and deep space missions. These modes are implemented in the 
: current development verion. This requires some rethink on the mitigation 
: rules and prefer peer concepts as the intervals between updates can be 
: significantly longer than the current engineering model. After some 
: thought I have revised the mitigation rules to support such things as 
: multiple prefer peers, multiple PPS sources and engineered fallback 
: should all sources fail. The revised rules are intended to cover the 
: existing GPS/PPS paradigm, sole PPS source and other more or less 
: bizarre hookups. The revised rules are at 
: www.eecis.udel.edu/~mills/ntp/http/prefer.html. They are in fact 
: implemented in the current development version, which should in almost 
: all cases be backwards compatible with previous versions..

Cool Stuff David.

"Almost all" cases.  Which ones aren't backwards compatible?

Warner


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