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office

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INTRODUCTION

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lwIP is a small independent implementation of the TCP/IP protocol

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suite that has been developed by Adam Dunkels at the Computer and

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Networks Architectures (CNA) lab at the Swedish Institute of Computer

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Science (SICS).

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The focus of the lwIP TCP/IP implementation is to reduce the RAM usage

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while still having a full scale TCP. This making lwIP suitable for use

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in embedded systems with tens of kilobytes of free RAM and room for

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around 40 kilobytes of code ROM.

FEATURES

* IP (Internet Protocol, IPv4 and IPv6) including packet forwarding over

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multiple network interfaces

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* ICMP (Internet Control Message Protocol) for network maintenance and debugging

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* IGMP (Internet Group Management Protocol) for multicast traffic management

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* MLD (Multicast listener discovery for IPv6). Aims to be compliant with

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RFC 2710. No support for MLDv2

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* ND (Neighbor discovery and stateless address autoconfiguration for IPv6).

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Aims to be compliant with RFC 4861 (Neighbor discovery) and RFC 4862

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(Address autoconfiguration)

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* UDP (User Datagram Protocol) including experimental UDP-lite extensions

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* TCP (Transmission Control Protocol) with congestion control, RTT estimation

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and fast recovery/fast retransmit

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* raw/native API for enhanced performance

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* Optional Berkeley-like socket API

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* DNS (Domain names resolver)

APPLICATIONS

* HTTP server with SSI and CGI

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* SNMPv2c agent with MIB compiler (Simple Network Management Protocol)

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* SNTP (Simple network time protocol)

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* NetBIOS name service responder

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* MDNS (Multicast DNS) responder

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* iPerf server implementation

LICENSE

lwIP is freely available under a BSD license.

DEVELOPMENT

lwIP has grown into an excellent TCP/IP stack for embedded devices,

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and developers using the stack often submit bug fixes, improvements,

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and additions to the stack to further increase its usefulness.

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Development of lwIP is hosted on Savannah, a central point for

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software development, maintenance and distribution. Everyone can

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help improve lwIP by use of Savannah's interface, Git and the

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mailing list. A core team of developers will commit changes to the

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Git source tree.

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The lwIP TCP/IP stack is maintained in the 'lwip' Git module and

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contributions (such as platform ports) are in the 'contrib' Git module.

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See doc/savannah.txt for details on Git server access for users and

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developers.

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The current Git trees are web-browsable:

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http://git.savannah.gnu.org/cgit/lwip.git

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http://git.savannah.gnu.org/cgit/lwip/lwip-contrib.git

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Submit patches and bugs via the lwIP project page:

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

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Continuous integration builds (GCC, clang):

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https://travis-ci.org/yarrick/lwip-merged

DOCUMENTATION

Self documentation of the source code is regularly extracted from the current

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Git sources and is available from this web page:

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

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There is now a constantly growing wiki about lwIP at

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http://lwip.wikia.com/wiki/LwIP_Wiki

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Also, there are mailing lists you can subscribe at

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http://savannah.nongnu.org/mail/?group=lwip

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plus searchable archives:

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http://lists.nongnu.org/archive/html/lwip-users/

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http://lists.nongnu.org/archive/html/lwip-devel/

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lwIP was originally written by Adam Dunkels:

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http://dunkels.com/adam/

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

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

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become familiar with the design of lwIP.

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Adam Dunkels <adam@sics.se>

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Leon Woestenberg <leon.woestenberg@gmx.net>

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