3lwIP is a small independent implementation of the TCP/IP protocol
4suite that has been developed by Adam Dunkels at the Computer and
5Networks Architectures (CNA) lab at the Swedish Institute of Computer
8The focus of the lwIP TCP/IP implementation is to reduce the RAM usage
9while still having a full scale TCP. This making lwIP suitable for use
10in embedded systems with tens of kilobytes of free RAM and room for
11around 40 kilobytes of code ROM.
15 * IP (Internet Protocol) including packet forwarding over multiple network
17 * ICMP (Internet Control Message Protocol) for network maintenance and debugging
18 * IGMP (Internet Group Management Protocol) for multicast traffic management
19 * UDP (User Datagram Protocol) including experimental UDP-lite extensions
20 * TCP (Transmission Control Protocol) with congestion control, RTT estimation
21 and fast recovery/fast retransmit
22 * Specialized raw/native API for enhanced performance
23 * Optional Berkeley-like socket API
24 * DNS (Domain names resolver)
25 * SNMP (Simple Network Management Protocol)
26 * DHCP (Dynamic Host Configuration Protocol)
27 * AUTOIP (for IPv4, conform with RFC 3927)
28 * PPP (Point-to-Point Protocol)
29 * ARP (Address Resolution Protocol) for Ethernet
33lwIP is freely available under a BSD license.
37lwIP has grown into an excellent TCP/IP stack for embedded devices,
38and developers using the stack often submit bug fixes, improvements,
39and additions to the stack to further increase its usefulness.
41Development of lwIP is hosted on Savannah, a central point for
42software development, maintenance and distribution. Everyone can
43help improve lwIP by use of Savannah's interface, Git and the
44mailing list. A core team of developers will commit changes to the
45Git source tree.
47The lwIP TCP/IP stack is maintained in the 'lwip' Git module and
48contributions (such as platform ports) are in the 'contrib' Git module.
50See doc/savannah.txt for details on Git server access for users and
53The current Git trees are web-browsable:
57Submit patches and bugs via the lwIP project page:
63The original out-dated homepage of lwIP and Adam Dunkels' papers on
64lwIP are at the official lwIP home page:
67Self documentation of the source code is regularly extracted from the
68current Git sources and is available from this web page:
71There is now a constantly growin wiki about lwIP at
74Also, there are mailing lists you can subscribe at
76plus searchable archives:
80Reading Adam's papers, the files in docs/, browsing the source code
81documentation and browsing the mailing list archives is a good way to
82become familiar with the design of lwIP.
84Adam Dunkels <email@example.com>
85Leon Woestenberg <firstname.lastname@example.org>