I am having difficulty getting a filter to work with flow-capture so that I can weed out back-ground noise that is filling up my capture files with stuff I don't want to see.


In my /etc/flow-tools/cfg/filter.cfg

filter-primitive Dump-SNMP
  type ip-port
  deny 161
  deny 162
  default permit

filter-primitive background-noise
  type ip-address-mask
  deny 192.168.0.0 255.255.252.0
  deny 224.0.0.0 240.0.0.0
  default permit

filter-definition noise
  match background-noise
  match Dump-SNMP

and I started flow-capture with:

flow-capture -w /data/flows -F noise -N 2 0/0/9800

And I get nothing stored to the files.

If I remove the -F noise switch, I get flooded with 2.8 megs of flow data every 15 minutes, and it's only 8 am.

Most of the noise comes from or to the subnets listed in "background-noise"

Am I gettig this filter right?

Nick


--
Nick Ellson
CCDA, CCNP, CCSP, CCAI, MCSE 2000, Security+, Network+
Network Hobbyist.


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