TCP Options
Just like options in the IP header extend IP functionality, TCP options extend TCP functionality. There are a variety of defined TCP options that are used for negotiating maximum segment sizes, window scaling factors, performing selective acknowledgments, recording timestamps, and providing padding for 4-byte boundaries. A node is not required to support all TCP options; however, the support for processing TCP options is required. The presence of TCP options is indicated by a Data Offset field with a value greater than 5 (0x5) (the TCP header is longer than 20 bytes).
A TCP option is either a single byte or multiple bytes. For multiple-byte options, the TCP option is in type-length-value format, where the length is the length in bytes ...
Get Windows Server® 2008 TCP/IP Protocols and Services 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.
