BIND 9.11.0 was released this week. BIND 9.11.0 and BIND 9.10.4 implement EDNS COOKIES. They are on by default in BIND 9.11.0 and BIND 9.10.4 Windows. For the non Windows builds of BIND 9.10.4 they need to be enabled at configure time. If your nameservers are not EDNS compliant, especially for unknown EDNS options, you could be seeing issues ranging from additional traffic, slow DNS lookups to full blown lookup failures. If you having fixed your servers already you need to fix them now. You can test your servers at https://ednscomp.isc.org/ednscomp/ to see if they are EDNS compliant. You can see EDNS compliance trends and list of failing servers at https://ednscomp.isc.org. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@isc.org