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[opennic-discuss] Sustained attack from 77.50.*

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  • From: Jeff Taylor <shdwdrgn AT>
  • To: discuss AT, OpenNIC DNS Ops <dns-operations AT>
  • Subject: [opennic-discuss] Sustained attack from 77.50.*
  • Date: Sat, 21 May 2016 10:37:39 -0600
  • Authentication-results:; dmarc=none
  • Dmarc-filter: OpenDMARC Filter v1.3.0 295B82D3F3

I have been getting hit by a sustained attack from for the past 5 hours, completely saturating my outgoing bandwidth. This is despite my T1 only allowing recursion from opennic servers, and my T2 only allowing whitelisted users, so I'm not exactly sure how they got around that...

The attack queries are searching for ANY +E. The domains being hit are listed below, and they are just being cycled through continuously.

Use this line to completely block the range of IP's if you also see this problem:
# iptables -I INPUT -s -j DROP

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