The TCP Standard
TCP is defined in RFC 793, which has been republished as STD 7 (TCP is an Internet Standard protocol). However, RFC 793 contained some vagaries which were clarified in RFC 1122 (Host Network Requirements). In addition, RFC 2001 introduced a variety of congestion-related elements to TCP, which have been included into the standard specification, although this RFC was superseded by RFC 2581 (a.k.a., RFC 2001bis). As such, TCP implementations need to incorporate RFC 793, RFC 1122, and RFC 2581 in order to work reliably and consistently with other implementations.
RFC 793 states that the Protocol ID for TCP is 6. When a system receives an IP datagram that is marked as containing Protocol 6, it should pass the contents of the datagram to TCP for further processing.
Get Internet Core Protocols: The Definitive Guide now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
