Query Rate limit in DNS server

BIND DNS

https://nsrc.org/workshops/2014/apricot14-security/raw-attachment/wiki/Agenda/3-2-4.dns-rate-limit.pdf

Unbound DNS

http://www.rmalekghasemi.ir/file/DNS_Rate_Limiting__Matthijs_Mekking.pdf

https://serverfault.com/questions/418810/public-facing-recursive-dns-servers-iptables-rules/419332

Sample File

http://www.rmalekghasemi.ir/file/iptables.sample.txt