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1 606 jeremybenn
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.
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FEATURES
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  * IP (Internet Protocol) including packet forwarding over multiple network
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    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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  * 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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  * Specialized raw/native API for enhanced performance
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  * Optional Berkeley-like socket API
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  * DNS (Domain names resolver)
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  * SNMP (Simple Network Management Protocol)
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  * DHCP (Dynamic Host Configuration Protocol)
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  * AUTOIP (for IPv4, conform with RFC 3927)
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  * PPP (Point-to-Point Protocol)
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  * ARP (Address Resolution Protocol) for Ethernet
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LICENSE
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lwIP is freely available under a BSD license.
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DEVELOPMENT
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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, CVS and the
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mailing list. A core team of developers will commit changes to the
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CVS source tree.
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The lwIP TCP/IP stack is maintained in the 'lwip' CVS module and
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contributions (such as platform ports) are in the 'contrib' module.
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See doc/savannah.txt for details on CVS server access for users and
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developers.
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Last night's CVS tar ball can be downloaded from:
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  http://savannah.gnu.org/cvs.backups/lwip.tar.gz [CHANGED - NEEDS FIXING]
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The current CVS trees are web-browsable:
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  http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/lwip/
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  http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/contrib/
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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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DOCUMENTATION
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The original out-dated homepage of lwIP and Adam Dunkels' papers on
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lwIP are at the official lwIP home page:
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  http://www.sics.se/~adam/lwip/
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Self documentation of the source code is regularly extracted from the
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current CVS 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 growin wiki about lwIP at
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  http://lwip.scribblewiki.com/
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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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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 
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Leon Woestenberg 
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