DNS - connection limit (without any extra hardware)

Frank Bulk frnkblk at iname.com
Fri Dec 8 23:19:21 UTC 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: 'nanog at nanog.org'
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

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


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