EDNS Keepalive
An EDNS option used with DNS over TCP to signal a desired idle timeout for a persistent connection. It can reduce repeated connection setup while allowing servers to control resource use.
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Browse the glossaryTransport glossary
3 definitions associated with Transport.
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Page 1 of 1Persistent connection
A TCP, TLS, QUIC, or other session reused for multiple DNS transactions rather than opened for each query. Persistence improves efficiency but requires connection limits and idle-time management.
Read definitionUser Datagram Protocol (UDP)
A connectionless transport protocol that sends independent datagrams without delivery, ordering, or duplicate-suppression guarantees. DNS and DHCP commonly use UDP, while applications add reliability themselves or switch to another transport when required.
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