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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. |
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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 <adam@sics.se> |
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Leon Woestenberg <leon.woestenberg@gmx.net> |
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