Projects / lwIP


lwIP is a lightweight implementation of the TCP/IP protocol stack. The focus of the lwIP TCP/IP implementation is to reduce RAM usage, thus making lwIP suitable for use in embedded systems with very limited resources.

Operating Systems

Recent releases

  •  02 Jan 2005 21:11

    Release Notes: Improves TCP throughput performance, fixes some small bugs in TCP, and fixes annoying bugs in the ARP cache and ARP packet queueing.

    •  18 Mar 2002 14:56

      Release Notes: A locking problem with the sequential API was corrected.

      •  04 Mar 2002 13:15

        Release Notes: A critical bug which could cause the stack to hang was fixed, as were a few smaller bugs.

        •  16 Feb 2002 00:08

          Release Notes: Ability to run as a user process under Linux, and a lot of small bugfixes.

          •  12 Dec 2001 11:32

            Release Notes: The operating system emulation layer was redesigned to make porting easier. Better control over TCP output buffers was added. Locking problems in buffer management and bugs in the sequential API have been fixed. A problem potentially causing IP forwarding to leak memory was fixed. Documentation was added.


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