[Bro] One-way TCP session to handle HTTP requests only

Rovnov Pavel provnov at solidex.by
Wed Mar 25 10:11:34 PDT 2015

Hello again!


I'm trying to run installation with client-to-server only traffic
visible to Bro. This seems not to break Bro however the following
messages fill weird.log:


1427302895.156616         C50xd821xHdTYgVRWj  172.x.x.x
33468  41223    data_before_established
-              F              bro

1427302895.228297         CqeQYQ1Q4MgbwupuR8             172.x.x.x
45107         13871                possible_split_routing
-              F              bro

1427302895.228985         CqeQYQ1Q4MgbwupuR8             172.x.x.x
45107         13871
data_before_established            -              F              bro

1427302895.782191         CiSuNR2tWAfGBpuSxe  172.x.x.x
55007     11898                possible_split_routing
-              F              bro

1427302895.783376         CiSuNR2tWAfGBpuSxe  172.x.x.x
55007     11898                data_before_established



Does anyone know how to switch Bro into asymmetric mode? At least can I
disable notices that need 2-way session?






From: Rovnov Pavel 
Sent: Wednesday, March 25, 2015 3:11 PM
To: 'bro at bro.org'
Subject: One-way TCP session to handle HTTP requests only




I'm looking for a monitoring solution that will give me an instrument to
log all HTTP requests (including HTTPS). I see that Bro does this really
well by default. But as soon as I will have huge amount of web traffic
(like 10Gb/s+) I would like to process HTTP requests only by mirroring
only one-way of TCP sessions. That will save a lot of processing power
since HTTP request << HTTP response.


I found only one reference to my idea that say that handling one-way TCP
at best will slow down Bro
). So the questions are:


1)      Can anyone confirm that using Bro to handle one-way TCP session
is a bad idea?


2)      Does anyone have any experience of tuning Bro to handle one-way
TCP sessions? We might turn off unnecessary processing (e. g. policies
that need 2-way session) to solve the task...






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