| # lwIP - A Lightweight TCP/IP Stack |

| Introduction |
Introduction News Documentation Mailing list Changelog Download Links |
lwIP is a small independent implementation of the TCP/IP protocol suite that has been developed by Adam Dunkels at the Computer and Networks Architectures lab at the Swedish Institute of Computer Science as part of the Connected project. The focus of the lwIP TCP/IP implementation is to reduce the RAM usage while still having a full scale TCP. This makes lwIP suitable for use in embedded systems with tenths of kilobytes of free RAM and room for around 40 kilobytes of code ROM. lwIP features: IP (Internet Protocol) including packet forwarding over multiple network interfaces ICMP (Internet Control Message Protocol) for network maintenance and debugging UDP (User Datagram Protocol) including experimental UDP-lite extensions TCP (Transmission Control Protocol) with congestion control, RTT estimation and fast recovery/fast retransmit Specialized no-copy API for enhanced performance Optional Berkeley socket API lwIP is freely avaliable (under a BSD-style license) in C source code format and can be downloaded from the download page. ## Latest news 2002-01-23 Florian Schulze announces that I hacked a port of lwIP to Win32 (Visual C++ 6.0). I did this mainly for testing some stuff, but it may be usefull for others as well. Its not really nicely done, but it works. It uses the WinPCap library for the netif. The sys_arch included is currently only single threaded. The zip-file containing the port can downloaded here. Older news. $Date: 2002/03/24 08:35:53 $

Adam Dunkels |