Interesting netflow entry

Bill Nash billn at odyssey.billn.net
Tue Feb 7 19:13:18 UTC 2006


On Tue, 7 Feb 2006, Christopher L. Morrow wrote:
>>
>> Are you sure you're getting everything?
>
> he did previously state he was only using about 120mbps... and it'd depend
> upon his/your sample rates as well...

Missed that part. Even so, 120mbps of actual usage, I would expect to see 
a higher volume. Sampling would definitely bring this down a bit, but for 
a volume that small, why bother sampling? You'll miss too much.

One problem I had while checking out various packages, flow-tools 
specifically, is that some can't handle differing flow versions. Also, 
flow generation from a routing-capable 6509 is configured in two different 
places, so the potential to lose flow traffic due to poor documentation 
(of both the collector and the generator) definitely exists. Flow-tools 
picks which version it processes based on the version of the first flow 
packet it receives, and then discards all else.

- billn



More information about the NANOG mailing list