====== DNS ======

  * https://www.dns-oarc.net/oarc/services/dnsentropy
  * http://dnsworkshop.org/
  * http://strotmann.de/~cas/bind-tricks-talk/
===== 資料 =====

  * [[http://tools.ietf.org/html/bcp38|BCP38 Network Ingress Filtering: Defeating Denial of Service Attacks which employ IP Source Address Spoofing]]