LWIP是TCP/IP协议栈的一种实现。LWIP的主要目的是减少存储器运用量与代码尺寸，使LWIP适合应用于小的、资源有限的处理器如嵌入式系统。为了减少处理器与存储器要求，lwIP能通过不需任何何数据据拷贝的API进行裁减。本文叙述了lwIP的设计与实现。叙述了协议实现及子系统中所使用的算法与数据结构如存储与缓冲管理系统。还包含LWIP API的参考手册与使用LWIP 的一些代码源码实例。

-LWIP is an implementation of TCP/IP protocol stack. LWIP' s main purpose is to reduce memory use and code size, LWIP suitable for small and limited resources, the processor, such as embedded systems. In order to reduce the processor and memory requirements, the lwIP through without any HE data, according to a copy of the API process of reducing. This paper describes the design and Implementation of the lwIP. Describes the protocol and subsystems used in the algorithms and data structures such as storage and buffer management system. Also contains the LWIP API reference manual and the use LWIP code source instance.