[Bro] Critical Stack requirements

Hosom, Stephen M hosom at battelle.org
Fri Jan 22 08:57:35 PST 2016


I don’t think that your subscriptions to intel feeds are what is causing this issue. I wouldn’t expect intel feeds to expand to fill that much memory space unless it were a truly massive amount of intel. You can certainly try reducing your subscriptions—I’ve definitely been wrong before. However, you should also check out a few other things:

How are you measuring memory utilization? The output of the linux ‘free’ command can be confusing to new users.
How big of a link are you trying to monitor?
Have you loaded any custom scripts into your Bro instance? It can be easy to fill a large amount of memory with Bro scripts.
What else is running on your Security Onion instance? A few of the tools distributed in Security Onion can be quite memory hungry.

Best of luck,


From: bro-bounces at bro.org [mailto:bro-bounces at bro.org] On Behalf Of Liam Randall
Sent: Thursday, January 21, 2016 1:13 PM
To: Monah Baki <monahbaki at gmail.com>
Cc: Bro-IDS <bro at bro.org>
Subject: Re: [Bro] Critical Stack requirements

Hey Baki,

Using the "Metrics" tab you can analyze the size in "count" of indicators by collection over time.

You may want to limit your deployments to between 100-200k indicators depending on cluster size, traffic, traffic types, etc.

There are three bambenek feeds available:
-- precomputed dga feed (900k + elements)
-- C&C IPs (260+)
-- C&C Domains (330+)

Try building a collection with fewer items on it and then issuing an update.

If you look under your "collections" tab the "status" column will give you some feedback about the size of your collection.

Please feel free to open a ticket with us directly if you have any further problems.


Liam Randall

On Thu, Jan 21, 2016 at 12:40 PM, Monah Baki <monahbaki at gmail.com<mailto:monahbaki at gmail.com>> wrote:
I subscribed to bambenekconsulting.com-DGA-Domains and the
master-public.bro.dat is 132MB in size.

I went with the most popular feed, I am open to suggestions as to what
feed to subscribe. I am interested in CNC alerts and malicious sites.

We have a 150MB pipe to the internet and around 70 users in the office.

I am running 1 worker though.


On Thu, Jan 21, 2016 at 12:27 PM, Mike Dopheide <dopheide at gmail.com<mailto:dopheide at gmail.com>> wrote:
> How many CriticalStack feeds are you subscribing to and against how much
> bandwidth are you monitoring?
> I've heard a rough recommendation that anything more than 100k indicators
> can be pretty rough.  We run with 90k against an average 1G traffic without
> any problems (14 workers).
> -Dop
> On Thu, Jan 21, 2016 at 11:19 AM, Monah Baki <monahbaki at gmail.com<mailto:monahbaki at gmail.com>> wrote:
>> Hi all,
>> Running SecurityOnion and trying to implement Criticial Stack with
>> Bro, server running 24GB RAM the system becomes unresponsive in 30
>> seconds. All memory and swap is utilized by then. Any documentation
>> that show sizing of Bro and Critical Stack?
>> If I remove criticalstack from local.bro, it's back to normal.
>> Thanks
>> Monah
>> _______________________________________________
>> Bro mailing list
>> bro at bro-ids.org<mailto:bro at bro-ids.org>
>> http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/bro
Bro mailing list
bro at bro-ids.org<mailto:bro at bro-ids.org>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ICSI.Berkeley.EDU/pipermail/bro/attachments/20160122/dd67cdb7/attachment.html 

More information about the Bro mailing list