这是一本介绍协议栈源代码的书，不是介绍“协议”的书。对协议非常感兴趣的

读者，本书是不太适合的，要看最好是去看RFC 。由于只分析内核最主要的代码，所

以提前跟读者打招呼：本书不是圣经。 -This is a book about the protocol stack source code, and not introduce the book " agreement" . Protocol is very interested readers, the book is not very suitable, look at best see RFC. Since only the most important analysis of the kernel code, so say hello to advance with the reader: This book is not the Bible.