RFC 6555: Happy Eyeballs: Success with Dual-Stack Hosts

When a server's IPv4 path and protocol are working, but the server's IPv6 path and protocol are not working, a dual-stack client application experiences…

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Outgoing relationships (9 related RFCs)

Normative reference — RFC 2119: Key words for use in RFCs to Indicate Requirement Levels
Normative reference — RFC 3484: Default Address Selection for Internet Protocol version 6 (IPv6)
Informative reference — RFC 5245: Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer Protocols
Informative reference — RFC 6269: Issues with IP Address Sharing
Informative reference — RFC 6454: The Web Origin Concept
Informative reference — RFC 6059: Simple Procedures for Detecting Network Attachment in IPv6
Informative reference — RFC 4436: Detecting Network Attachment in IPv4 (DNAv4)
Informative reference — RFC 6157: IPv6 Transition in the Session Initiation Protocol (SIP)
Informative reference — RFC 1671: IPng White Paper on Transition and Other Considerations

Incoming relationships (16 related RFCs)

Obsoleted by — RFC 8305: Happy Eyeballs Version 2: Better Connectivity Using Concurrency
Normatively referenced by — RFC 7269: NAT64 Deployment Options and Experience
Normatively referenced by — RFC 7359: Layer 3 Virtual Private Network (VPN) Tunnel Traffic Leakages in Dual-Stack Hosts/Networks
Normatively referenced by — RFC 6556: Testing Eyeball Happiness
Normatively referenced by — RFC 7703: Experience with Testing of Mapping of Address and Port Using Translation (MAP-T)
Normatively referenced by — RFC 8136: Additional Transition Functionality for IPv6
Informatively referenced by — RFC 7556: Multiple Provisioning Domain Architecture
Informatively referenced by — RFC 6897: Multipath TCP (MPTCP) Application Interface Considerations
Informatively referenced by — RFC 7305: Report from the IAB Workshop on Internet Technology Adoption and Transition (ITAT)
Informatively referenced by — RFC 7711: PKIX over Secure HTTP (POSH)
Informatively referenced by — RFC 6589: Considerations for Transitioning Content to IPv6
Informatively referenced by — RFC 7123: Security Implications of IPv6 on IPv4 Networks
Informatively referenced by — RFC 7526: Deprecating the Anycast Prefix for 6to4 Relay Routers
Informatively referenced by — RFC 6948: Some Measurements on World IPv6 Day from an End-User Perspective
Informatively referenced by — RFC 7690: Close Encounters of the ICMP Type 2 Kind (Near Misses with ICMPv6 Packet Too Big (PTB))
Informatively referenced by — RFC 7984: Locating Session Initiation Protocol (SIP) Servers in a Dual-Stack IP Network