sequence number:
RFC250: Some thoughts on file transfer.
RFC281: Suggested addition to File Transfer Protocol.
RFC721: Out-of-Band Control Signals in a Host-to-Host Protocol.
RFC761: DoD standard Transmission Control Protocol.
RFC793: Transmission Control Protocol.
RFC1110: Problem with the TCP big window option.
RFC1948: Defending Against Sequence Number Attacks.
RFC2890: Key and Sequence Number Extensions to
RFC4302: IP Authentication Header.
RFC4385: Pseudowire Emulation Edge-to-Edge (PWE3) Control Word for Use over an MPLS