TCP/IP Illustrated, Volume 2: The Implementation by Gary R. Wright and W. Richard Stevens serves as a foundational text for understanding the 4.4BSD-Lite kernel implementation of the TCP/IP protocol suite, featuring 15,000 lines of code and extensive illustrations. It covers essential low-level networking topics including memory management (mbufs), the socket layer, and protocol operations for network engineers and kernel developers. For more details, visit Pearson . TCP/IP Illustrated: The Implementation, Vol. 2 - Amazon.com