The ELK stack does a good job of collecting netflow records with the addition of Filebeat.  Check out my tattle-tale tool that collects netflow data: https://github.com/racompton/tattle-tale It has numerous rules in logstash/conf.d to try to just look for spoofed DDoS amplification requests but if you remove those rules (except for 40-ifName.conf

and 50-reverse-dns.conf) it should be a pretty nice netflow collection solution.  If you are looking for a free solution to identify DDoS attacks from netflow and generate Flowspec rules, check out https://github.com/pavel-odintsov/fastnetmon

Also, here’s a doc for best practices when implementing Flowspec: https://www.m3aawg.org/flowspec-BP

-Rich

From: NANOG <nanog-bounces+rich.compton=charter.com@nanog.org> on behalf of Joe Loiacono <jloiacon@gmail.com>
Date: Monday, May 16, 2022 at 1:11 PM
To: NANOG list <nanog@nanog.org>, Matthew Crocker <matthew@corp.crocker.com>
Subject: [EXTERNAL] Re: Free-ish Linux Netflow collector/analyser options

CAUTION: The e-mail below is from an external source. Please exercise caution before opening attachments, clicking links, or following guidance.

Try FlowViewer (analyzing, graphing, tending software) + SiLK (robust, high-performance capture software from Carnegie-Mellon).

Pretty full netflow analysis package; free.

See: http://flowviewer.net

Joe

On 5/16/2022 2:34 PM, Matthew Crocker wrote:

I’m looking for a free-ish Linux open sources Netflow collector/analyser.  I have 5 Juniper MX routers that will send IPFIX flows to for an ISP network.    I’m hoping it is something I can run in AWS/EC2 as I don’t want to worry about storage again in my lifetime.  Does anyone have any recommendations?

For reporting I would like to generate basic  usage reports to/from IP/Subnet/ASN.  It would be great if it could also detect DDoS and activate flowspec back into my core routers but that isn’t a requirement

Thanks

-Matt