[Bro] Multi tap architecture

Johanna Amann johanna at icir.org
Thu Dec 28 07:59:57 PST 2017

Hi Pierre,

just to recap if I understand everything correctly: you have low-powered
boxes that you just want to capture traffic on, without analyzing the
payload, because they are too low powered. And then you would like to do
the protocol analysis on another machine.

Bro itself does not support this scheme - parsing has to happen on the
same instance that does the capturing. It sounds like you might want to
use some other software that can just duplicate and forward interesting
traffic to a more high-powered machine, where you can perform the actual

I have never built a setup like this myself - but I suspect you might even
be able to do this directly in Linux using onboard tools; create a
tunneled interface that sends traffic to the destination that you want to
send it to and mirror traffic to that interface - or something similar to


On Sun, Nov 12, 2017 at 02:05:19PM +0100, bro-ml at razaborg.fr wrote:
> Hi everyone,
> I'm looking to build a Bro architecture with several Tap components (I
> mean the tcpdump stuff), all separated from the core.
> I've seen the "cluster" architecture
> (https://www.bro.org/sphinx/cluster/index.html), but as I said I want to
> split out the capture work, not the protocol analysis stuff.
> My situation is the following : I have several "boxes" (with not enough
> power to do the protocol analysis work, that's the point) in different
> networks, all connected to one single "core" component. I would like to
> deploy network capture (Tap) instances on all those boxes, and let the
> core component do all the hard stuff (I can potentially install a
> front-end on this core component to set up many "workers" behind it).
> Is there any way to do this ? Any documentation ? Does anyone have any
> clue about how to set it up that way ?
> Thanks a lot,
> Pierre
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