Open source Netflow analysis for monitoring AS-to-AS traffic
Steven Bakker
steven.bakker at ams-ix.net
Sun Mar 31 09:53:11 UTC 2024
Hi Peter,
Thanks for that link. I did read the spec, and while the definition itself is clear, the escape clause gives a lot of wiggle room:
"Hardware limitations may prevent an exact reporting of the underlying frame length, but an agent should attempt to be as accurate as possible."
I read that as, "the vendor will do whatever it pleases, and you should be grateful to receive a non-negative integer at all." I could be too cynical, though.
Anyway, this particular vendor does other funny things (such as sometimes stripping the q-tag headers from the sampled frame; throttling the frame sampling on the box, but not adjusting the sampling interval in the sFlow exports) that make it a true joy to work with this gear. ;-)
Cheers,
-- Steven
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