Category Archives: ossim

Ossim & Netflow

I have started to use OSSIM, to monitor network issues and security.

My first steps with OSSIM have been with Netflow module (nfsen).

This is a mini Howto, to configure Nfsen in OSSIM server, to monitor Cisco Routers.

Configure netflow in Cisco Router
config t
interface FastEthernet 0/0 (or whatever you want)
ip route cache-flow

ip flow-export destination “dst ip” “dst port”
ip flow-export source “src interface”
ip flow-export version 5

ip flow-cache timeout active 1
ip flow-cache timeout inactive 15

write mem

Whit this, We already configured our device

Configure Nfsen

Then We have to add this device in nfsen.conf:

%sources = (
‘Router’ => { ‘port’ => ‘9567’, ‘col’ => ‘#0000ff’, ‘type’ => ‘netflow’}

Afther this we have to reconfig nfsen:

/usr/nfsen/bin/nfsen reconfig

Now, I have started to configure OSSEC and Snort modules. When I have a good results I will post another howto with this modules.

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