>I was looking at trying out flow monitoring and I found pfflowd, but 
>unfortunately it does not work with FreeBSD >9.0. I thought about ng_netflow 
>but that doesn't >see my tun interface which may be related to..
>WARNING: attempt to domain_add(netgraph) after domainfinalize()

Noise message. I've never seen it actually mean anything.

The problem is that tun0 is a generic network interface. Ng_ether only exposes 
Ethernet devices. The equivalent to tun but for an Ethernet device is tap. 
Creating a tap device after boot immediately creates the corresponding ng_ether 
node which can then be plumbed into ng_netflow.

Some software is kind enough to work with either tun or tap as a configurable 
option.

>Does anyone have any recommendations for generating flow information from PF?

I've had great success with ng_netflow. I like the fact that all the processing 
is in-kernel.
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