Another one :)
Is it better to be connected to a tier 2 on a reasonably local server,
or a tier 1 further away?
There are no tier 1s in the UK (that I can find, anyway) - the two that
are commonly listed are dead, so I peered with some in Europe (temporary
until I get a proper GPS timesource & do it 'properly').
There are plenty of tier 2s (although they're all 15/16 hops away - just
to get out of my ISP takes 10 hops).
eg. ntp2.pipex.net is 17ms away.. however an ntpq on it shows that it is
just a downlevel to ntp1.nl.uu.net in the netherlands - which is only
23ms/16 hops so I can peer to it directly.
ntp1.mcc.ac.uk is physically closer (about 5 miles in a straight line)
but 17 hops and 22ms away... that's peered off 3 (closed) tier 1 peers
only 6 ms from it.. more accurate I guess.. but it's further away in
'internet' distance.
I guess what I'm thinking is the cumulative error gets greater the lower
you go down the ranking, so it's better to peer with a tier one further
way because you've not got to worry about the error introduced by the
intermiediate client. Is this is in the right ballpark?
Tony
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