RFC 3514: The Security Flag in the IPv4 Header

Firewalls, packet filters, intrusion detection systems, and the like often have difficulty distinguishing between packets that have malicious intent and those…

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Incoming relationships (9 related RFCs)

Normatively referenced by — RFC 6592: The Null Packet
Normatively referenced by — RFC 7514: Really Explicit Congestion Notification (RECN)
Normatively referenced by — RFC 9401: The Addition of the Death (DTH) Flag to TCP
Informatively referenced by — RFC 6189: ZRTP: Media Path Key Agreement for Unicast Secure RTP
Informatively referenced by — RFC 5841: TCP Option to Denote Packet Mood
Informatively referenced by — RFC 3675: .sex Considered Dangerous
Informatively referenced by — RFC 5241: Naming Rights in IETF Protocols
Informatively referenced by — RFC 6593: Service Undiscovery Using Hide-and-Go-Seek for the Domain Pseudonym System (DPS)
Informatively referenced by — RFC 8136: Additional Transition Functionality for IPv6