In BIND, is there an "additional local" limit on the payload size of
EDNS responses the server can send? Is it configurable? edns-udp-size
sets the advertised buffer size for responses going TO the server. Is it
also used as the limit on responses going FROM the server (in addition
to the limit advertised by the client)?

In other words, if my authoritative nameserver is behind a device that
drops outgoing fragmented packets, can I configure BIND to not send EDNS
responses that would require fragmentation?

BIND 9.3.5-P1, if that matters.

Thank you,