[Oisf-users] Suricata and DDoS Attack

Peter Manev petermanev at gmail.com
Wed Jan 27 10:16:28 UTC 2016

On Wed, Jan 27, 2016 at 9:59 AM, Victor Julien <lists at inliniac.net> wrote:
> On 27-01-16 03:00, Leonard Jacobs wrote:
>> With one of the networks we monitor, the ISP was under a DDoS attack
>> yesterday.  It appears that Suricata kept functioning the whole time the
>> attack was occurring because we kept seeing events.  However, somewhere
>> along the way the IPS appeared to lock up.  The appliance was rebooted
>> and everything came back to normal.

What do you mean by "lock up"   - process stops responding or it
segfaults or something else?
Anything strange in the last update in stats.log?

>> We run the IPS in AF-Packet mode.  The actual network we monitor was not
>> directly under the DDoS attack but slow Internet response times was
>> experienced.
>> Is it possible that Suricata was experiencing some resource exhaustion?
>> Logs did not show anything wrong.
> Hard to say without more info. If it would happen again before killing
> Suricata, could you attach to with gdb and create a back trace?
> gdb --attach $(pidof suricata)
> then inside gdb
> (gdb) set logging on
> (gdb) thread apply all bt
> Then press return till you get back to the prompt. Then type quit. This
> process has created a gdb.txt file containing a copy of the output that
> describe the state of the different threads. You can then attach this file
> to the bug report.
> --
> ---------------------------------------------
> Victor Julien
> http://www.inliniac.net/
> PGP: http://www.inliniac.net/victorjulien.asc
> ---------------------------------------------
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Peter Manev

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