Am 04.11.2015 um 11:22 schrieb Andrew Holway:
The server in question is a Centos 7 based FreeIPA server, OpenVPN
concentrator and DNS server.

Can have been a DNS amplification attack.

https://www.us-cert.gov/ncas/alerts/TA13-088A

https://blog.cloudflare.com/deep-inside-a-dns-amplification-ddos-attack/

Alexander

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