On Mon, 27 Jun 2011, Florian Weimer wrote:
1 Is this problem happening because EDNS failure is not remembered for
forwarders?
There is no realiable way to detect EDNS support in forwarders, so there
isn't anything to remember, really. Sadly, the situation with
authoritative servers is not much better.
That is not entirely true, because bind does log a message that it is
disabling EDNS, and then gets the query out. So it could remember
that state for a little while? But currently, it appaers to not do
that, so a forwarder with broken EDNS creates havoc on a busy server
in combination with serving TTL=0 records.
Paul
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