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RFC 2671 - Extension Mechanisms for DNS (EDNS0)

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Extension Mechanisms for DNS (EDNS0) (RFC 2671, ; obsoleted by RFC 6891)

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RFC 2671: Extension Mechanisms for DNS (EDNS0)

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https://datatracker.ietf.org/doc/html/rfc2671

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IETF Datatracker

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The Domain Name System's wire protocol includes a number of fixed fields whose range has been or soon will be exhausted and does not allow clients to advertise their capabilities to servers. This document describes backward compatible mechanisms for allowing the protocol to grow. [STANDARDS-TRACK]

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