[ntp:questions] Graphing NTP bandwidth usage?

Terje Mathisen terje.mathisen at tmsw.no
Thu Mar 27 08:11:55 UTC 2014

Jason Rabel wrote:
> A while back I saw a couple web pages where people graphed various
> aspects of their NTP server(s).
> One of the graphs of particular importance to me was where they
> showed NTP specific inbound & outbound bandwidth.

MRTG data from the server switch port?

> For the life of me I can't figure out how they did it though. Are
> they fudging the numbers based on 'ntpdc -c iostats' and using the
> packets sent / received and multiplying by some arbitrary number of
> bytes? Or maybe monitor it via iptables?

Since all normal ntp requests (modulo authentication) are exactly the 
same size, you can indeed get a good estimate by simply taking the 
number of requests and multiply by the packet size (including all header 
overheads). The in/out bandwidth should be pretty much identical.
> Thoughts, ideas, suggestions?

See above. :-)


- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"

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