[ntp:questions] Re: offset of two acts servers

David Woolley david at djwhome.demon.co.uk
Fri Feb 3 07:41:27 UTC 2006


In article <11u59933rt89sae at corp.supernews.com>,
rtxo <gnu at wraith.sf.ca.us> wrote:

> I wonder whats going on with these hosts. The refclock_acts driver code has
> a comment that claims the acts adjusts for the round trip delay.

The driver cannot compensate for the round trip delay time from the stratum
1 server to your stratum 2 client (it only runs on the stratum one server
and has no knowledge of your client).  The NTP algorithms compensate compensate
for a symmetrical round trip delay but cannot compensate for any assymmetry
(at least for the minimum delay - there is an option, huff and puff, to 
compensate for temporary excesses).




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