My planned work on networking stack
andre at freebsd.org
Fri Mar 5 06:22:23 PST 2004
Gleb Smirnoff wrote:
> On Thu, Mar 04, 2004 at 12:26:51PM -0500, James wrote:
> J> > that was my thought initially, BUT.. actually... you can
> J> > actually do this no problem using mrtd dumps and pick it up with a
> J> > program via bgp device :P no need to create another api it seems :)
> J> errr??? I meant bpf device...
> Implementing traffic accounting like ip accounting or netflow through
> a bpf is generally a bad idea, because of poor performance of such a solution.
This is not the case. While common wisdom does indeed suggest that BPF
is slow it is in fact not the case. We have a netflow-like per AS-number
traffic accounting daemon which takes only 2-3% of the CPU on our core
routers. We are currently preparing that software package for public
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