[Oisf-users] Missing Alerts? May be the network

Tiago Faria tiago.faria.backups at gmail.com
Sun Mar 17 15:23:23 UTC 2019

I actually found the thread a couple of weeks ago and went back to read it!
That's really awesome that everything is working now! Thanks for the update
(success stories are always motivating :))

On Sun, Mar 17, 2019 at 3:14 PM Greg Grasmehr <greg.grasmehr at caltech.edu>

> Hello All,
> Some of you may remember in early-mid 2018 I was essentially pulling my
> hair out trying to figure out why Suricata was apparently missing alert
> traffic on our 10G wire.  Network claimed everything was hunky dory on
> their end, and I spent countless hours testing different configs and
> rule sets trying to determine what was going on.
> Fortunately I attended Zeekcon last October and one of the presentations
> got me looking at our Zeek data and then to thinking.
> Long story short - one of the SPANS feeding our Arista switch turned out
> to be saturated and dropping packets on the edge switch feeding the
> Arista.  Once that was rectified Suricata was finally receiving all
> network data and with Hyperscan enabled easily handling the traffic,
> even during micro bursts exceeding 10G, and this is with more than 57000
> rules enabled.  As far as I can tell it doesn't miss a thing now. w00t!
> --
> Sincerely,
> Greg Grasmehr
> Lead Information Security Analyst
> California Institute of Technology (Caltech)
> GPGMe: 38E2 F9BD A95E 9824 20AB  331A 9E29 D1A1 AAEE 5F42
> pgp.mit.edu:11371/pks/lookup?op=vindex&search=0x9E29D1A1AAEE5F42
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