325N/AINTRODUCTION

325N/A

1339N/AlwIP is a small independent implementation of the TCP/IP protocol

325N/Asuite that has been developed by Adam Dunkels at the Computer and

1339N/ANetworks Architectures (CNA) lab at the Swedish Institute of Computer

325N/AScience (SICS).

325N/A

919N/AThe focus of the lwIP TCP/IP implementation is to reduce the RAM usage

919N/Awhile still having a full scale TCP. This making lwIP suitable for use

919N/Ain embedded systems with tens of kilobytes of free RAM and room for

919N/Aaround 40 kilobytes of code ROM.

919N/A

919N/AFEATURES

919N/A

919N/A * IP (Internet Protocol) including packet forwarding over multiple

919N/A network interfaces

919N/A * ICMP (Internet Control Message Protocol) for network maintenance

919N/A and debugging

919N/A * UDP (User Datagram Protocol) including experimental UDP-lite

919N/A extensions

919N/A * TCP (Transmission Control Protocol) with congestion control, RTT

919N/A estimation and fast recovery/fast retransmit

919N/A * Specialized API for enhanced performance

919N/A * Optional Berkeley socket API

325N/A

325N/ALICENSE

325N/A

325N/AlwIP is freely available under a BSD license.

493N/A

325N/ADEVELOPMENT

970N/A

970N/AlwIP has grown into an excellent TCP/IP stack for embedded devices,

970N/Aand developers using the stack often submit bug fixes, improvements,

970N/Aand additions to the stack to further increase its usefulness.

325N/A

1179N/ADevelopment of lwIP is hosted on Savannah, a central point for

325N/Asoftware development, maintenance and distribution. Everyone can

911N/Ahelp improve lwIP by use of Savannah's interface, CVS and the

1179N/Amailing list. A core team of developers will commit changes to the

1179N/ACVS source tree.

911N/A

325N/AThe lwIP TCP/IP stack is maintained in the 'lwip' CVS module and

325N/Acontributions (such as platform ports) are in the 'contrib' module.

325N/A

325N/ASee doc/savannah.txt for details on CVS server access for users and

1179N/Adevelopers.

493N/A

325N/ALast night's CVS tar ball can be downloaded from:

970N/A http://savannah.gnu.org/cvs.backups/lwip.tar.gz [CHANGED - NEEDS FIXING]

970N/A

970N/AThe current CVS trees are web-browsable:

325N/A http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/lwip/

325N/A http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/contrib/

Submit patches and bugs via the lwIP project page:

http://savannah.nongnu.org/projects/lwip/

DOCUMENTATION

The original out-dated homepage of lwIP and Adam Dunkels' papers on

lwIP are at the official lwIP home page:

http://www.sics.se/~adam/lwip/

Self documentation of the source code is regularly extracted from the

current CVS sources and is available from this web page:

http://www.nongnu.org/lwip/

Reading Adam's papers, the files in docs/, browsing the source code

documentation and browsing the mailing list archives is a good way to

become familiar with the design of lwIP.

Adam Dunkels <adam@sics.se>

Leon Woestenberg <leon.woestenberg@gmx.net>