References
[RFC2018] M. Mathis, J. Mahdavi, S. Floyd, A. Romanow, "TCP Selective Acknowledgment Options", 10/17/1996, 12 pages.
[RFC1739] G. Kessler, S. Shepard, "A Primer On Internet and TCP/IP Tools", 12/22/1994, 32 pages.
[RFC1693] T. Connolly, P. Amer, P. Conrad, "An Extension to TCP : Partial Order Service", 11/01/1994, 36 pages.
[RFC1644] R. Braden, "T/TCP -- TCP Extensions for Transactions Functional Specification", 07/13/1994, 38 pages.