North American Network Operators Group

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RE: DNS - connection limit (without any extra hardware)

  • From: Frank Bulk
  • Date: Fri Dec 08 18:44:41 2006

You could also look at Cloudshield.  I was following the EveryDNS issue this weekend and this item among the regular VON press release blast jumped out at me:

From: Frank Bulk
Sent: Friday, December 08, 2006 8:59 AM
To: '[email protected]'
Subject: DNS - connection limit (without any extra hardware)

as a comsequence of a virus diffused in my customer-base, I often receive big bursts of traffic on my DNS servers.
Unluckly, a lot of clients start to bomb my DNSs at a certain hour, so I have a distributed tentative of denial of service.
I can't blacklist them on my DNSs, because the infected clients are too much.

For this reason, I would like that a DNS could response maximum to 10 queries per second given by every single Ip address.
Anybody knows a solution, just using iptables/netfilter/kernel tuning/BIND tuning, without using any hardware traffic shaper?

Best Regards