Simple definition
EDNS is a concept or mechanism used in a network & dns to extend protocol capabilities DNS.
Technical definition
In a business environment, EDNS mainly to extend the protocol’s capabilities DNSIts implementation depends on the architecture, equipment and security policies in place.
What is it used for?
extending protocol capabilities DNS.
Practical example
EDNS allows answers DNS more voluminous and carries additional options.
Common issues
- fragmentation UDP
- firewall old
- size of buffer incompatible
Key takeaway: Always adapt the diagnosis to the product version and the architecture actually deployed.