Revisión del 18:45 26 jul 2006

Analisis de trafico

NetFlow

Informacion

• http://www.switch.ch/tf-tant/floma/software.html

flowscan

http://www.caida.org/tools/utilities/flowscan/ Reportes de ejemplo:

• http://mrtg.uv.es/flowscan/
• http://wwwstats.net.wisc.edu/
• http://flowscan.frgp.net/

flow-tools vs cflowd

Why use flow-tools instead of cflowd?

• flow-capture preserves the sub-second portion of the NetFlow timestamps that cflowd discards
• flow-tools is easier to build because it is written in portable C. Problems with building cflowd may occur because it requires cutting edge C++ features
• flow-tools is actively maintained, and supports newer NetFlow versions, including those from the popular Cisco Cat6K series platforms

Analisis del trafico por una interface ethernet en un servidor debian

Fuente: http://www.prolixium.com/sitenews.php?id=482

apt-get install fprobe-ng flow-tools flowscan flowscan-cuflow flowscan-cugrapher rrdtool
mkdir -p /var/lib/netflow/ft
mkdir /var/lib/netflow/rrds
mkdir /var/lib/netflow/scoreboard

Dejar /etc/flow-tools/flow-capture.conf solo con:

-w /var/lib/netflow/ft -E 1G -N 0 -n 287 -S 60 -V 5 -z 9 0/0/555

Reiniciar el servicio

/etc/init.d/flow-capture restart

dejar /etc/flowscan/flowscan.cf con

FlowFileGlob /var/lib/netflow/ft/ft-v05.*
ReportClasses CUFlow
WaitSeconds 30
Verbose 1

/etc/flowscan/CUFlow.cf

Se puede ver la sintaxis aca: http://www.columbia.edu/acis/networks/advanced/CUFlow/CUFlow.html

Errores

Errores al correr flowscan

2006/07/26 18:12:22 working on file /var/lib/netflow/ft/ft-v05.2006-07-26.174716-0300...
/var/lib/netflow/ft/ft-v05.2006-07-26.174716-0300: Invalid index in cflowd flow file: 0xCF100103! Version 5 flow-export is required with *all* fields being saved.

Pasa con la version 0.67-8 This is because the contributed CFlow perl module is configured before flow-tools is compiled and thus the module gets compiled without any support for flow-tools. Bug#327367

Otros

• potion
• Howto: Performance Benchmarks a Web server