On 10/1/14 8:17 AM, Barry Margolin wrote:
In article <mailman.1035.1412133286.26362.bind-us...@lists.isc.org>,
  Eli Heady <eli.he...@gmail.com> wrote:

With response sizes growing (dnssec, ipv6), answers are more likely to be
too large for UDP.

That's unlikely. That's why EDNS was created, so that these large
answers wouldn't require TCP.

... and more than a decade later EDNS still fails very often due to misconfigured and/or ancient firewalls that don't understand it. 53/TCP is part of the spec, and should not be blocked.

Doug


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