Extension mechanisms for DNS (EDNS) is a feature that expands the size of various DNS protocol parameters with size restrictions when it comes to increased protocol functionality.
The first set of extensions was published by the IETF as RFC 2671 (also known as EDNS0) in 1999.
EDNS0 means a DNS UDP message length greater than 512 bytes.
Some Firewalls may block such a message, assuming the maximum size of the DNS message is 512 bytes.
Since FortiGate Version 5.2 it supports EDSN0 and DNS messages greater than 512 bytes in length.
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