OK Im confused, too much reading.

How many netflow probes can NTOP handle?

I have 6 x 3550 ciscos all netflow logging to the one NTOP box - is this ok?

The netflow plugin asks for a "Virtual Netflow Interface" and I dont know what to use 
for this address.

Ive read some comments that it is the 'probes' address (if so what mask? and what 
affect will different mask have?)

If it is 'the probes' address then how do I apply this to the 6 probes (or 3550 
routing switches).

My networks are:
 172.20.0.0
 172.21.0.0
 172.22.0.0
 172.23.0.0
 203.18.184.0
 203.18.185.0
 203.20.255.0

My netflow probes are:
 Campus 1 (Users/Firewall/ISA/Servers)
  C3550 172.20.0.2 -> HSRP 172.20.0.1
  C3550 172.20.0.3 -> HSRP 172.20.0.1
  C3550 172.20.0.4

 Campus 2 (Users/Servers)
  C3550 172.21.0.2 -> HSRP 172.21.0.1
  C3550 172.21.0.3 -> HSRP 172.21.0.1

 Campus 3 (Users)
  C3550 172.22.1.80

All six C3550 are netflow pumps to NTOP
All Vlans on all C3550 are "ip route-cache flow"

What is the 'Virtual Netflow Interface' and mask?

Why am I not seeing all the traffic - mostly seeing Telnet, SNMP (Switch monitoring), 
DNS (nameserver), NBios-IP and DHCP-BOOTP (not much though)?


Sean Dunlop
Network & Security Consultant
Department of Treasury & Finance 
200 St Georges Tce 
Perth WA 6000 
Phone - (08) 9262 1405 
Fax - (08) 9262 1496 
Email - [EMAIL PROTECTED] 
Web - www.dtf.wa.gov.au 



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