Greetings all,

On 25 June 2014 23:59, Roland Dobbins <> wrote:
EDNS0 has been in pervasive use for something like 15 years, so it isn't something new or exotic.

also noteworthy to mention is that Bind performing recursive DNS functions will look at whether EDNS0 usage causes problems with individual resolvers, and retry queries without EDNS0 if it suspects it could be a problem.  Long-term anyone operating an authoritative name-server which can't serve EDNS0 (for what ever reason), is in for a bad time - DNSSEC necessitates large responses. provides some highlights on Bind's behaviour.

Mark Goldfinch
Platform Manager, Modica Group
Tel: +64 4 498 6000

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