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http://meetings.apnic.net/__data/assets/pdf_file/0017/45521/05-Merike-Kaeo-Passive-DNS.pdf
http://conferences.npl.co.uk/satin/presentations/satin2011slides-Rasmussen.pdf
DNS firewall:
http://www.senki.org/using-dns-to-protect-your-network-and-your-customers/
http://www.slideshare.net/BarryRGreene/binds-new-security-feature-dnsrpz-the-quotdns-firewallquot
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