> Is there any consensus on what is to be considered an abusive client?
> What are the figures for a perfectly sane client?

Consensus - I doubt it ;)  Figures are going to depend on the client and 
whether it's in start-up or steady state mode...  or whether it's a load of 
PCs on a corporate LAN all behind a single IP...

Currently I've enabled kod's in ntpd and set:

discard average 30 minimum 1 monitor 1

...which I'm reading as packets from a single IP address where the average 
spacing is < 30s or are spaced < 1s apart have 100% chance of being 
discarded.  'average' and 'minimum' aren't fully defined in the 
documentation.

The I/O packets plot for my server 
(http://www.ljay.org.uk/gr/graphs_ntp.html) shows ntpd responding to peaks 
and then tailing off.  Bandwidth seems to be slowly tailing off, but maybe 
that's just because lots of people turned their office PCs off for 
Christmas..!

Going to leave those settings for a while and see how it runs...

Laurence
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