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RFC 9927 - Fixing the C-Flag in the Extended Address Registration Option (EARO)

  • Status: Proposed Standard
  • Published: February 2026
  • Stream: IETF
  • Errata: No Errata

Abstract​

This document fixes the definition and processing of the C-Flag in the Extended Address Registration Option (EARO). EARO is used with IPv6 Neighbor Discovery (IPv6 ND) for address registration, especially in constrained-network environments. The update clarifies how nodes interpret the C-Flag so that IPv6 ND implementations can interoperate consistently when registering or renewing addresses.

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