Juniper calls it j-flow. I *think* it's sampled netflow but not sure. There is 
tons of info on the web though. I plan to light this in my SRX soon as well.

Of course you can always mirror the switch port the firewall is connected to.

From: Esteban Torres Rodríguez [mailto:[email protected]]
Sent: Wednesday, June 15, 2011 04:56 PM
To: [email protected] <[email protected]>
Subject: [Ntop] SGG Juniper with Ntop

I need information on how I can monitor the traffic of my SGG 550 Juniper with 
Ntop.

sFlow perhaps?

I tried Ntop in my squid, but I want to monitor traffic to my firewall.





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