haohd / lwip-linux

This is a version of lwip running on Ubuntu

lwip-linux

This is a version of lwip running on Ubuntu

1. Ubuntu Setup

Install libpcap-dev

sudo apt-get install libpcap-dev

2. Compile

Go to the folder ./Debug, then run:

make clean; make

3. Run tests

Must be run under root user

3.1 Echo server test

Under the header file ./lwip-2.0.2/test/linux/lwip.h, set TEST_ID to ECHO_SERVER

    #define TEST_ID 	ECHO_SERVER

Then, re-compile the source code, and run the lwip-linux app. Use puty to connect to server at port 6677.

3.2 TCP client test

Under the header file ./lwip-2.0.2/test/linux/lwip.h, set TEST_ID to TCP_CLIENT

    #define TEST_ID 	TCP_CLIENT

Then, re-compile the source code, and run the lwip-linux app.

Notes:

• The remote server address is being hard code at "192.168.2.12", we can modify this address via macro TCP_REMOTE_SERVER_ADDR under ./lwip-2.0.2/test/linux/lwip.h.
• Remote server port is 6677, it can be changed via macro TCP_REMOTE_SERVER_PORT.

4. Other notes

• lwip-linux only supports 32 local server ports from 6677 to 6709. When we create a tcp server, please use the server port in this range.
• For local client ports, the lwip-linux supports to allocate port in range from 49152 to 49184.

lwip-linux's Issues

Too many duplicate ACK with ECHO_SERVER example

My environment is Multipass Ubuntu 22.04, on macOS Monterey. Echo server example seems to work just fine over telnet, but I am seeing lots of duplicate ACKs on Wireshark capture. Just sending one message "hello", there are about 4000 lines of duplicate ACKs. Please see screenshot attached:

consistancy in client server

hi,
I am using these lwip code and creating a client and server code.When i am sending and receiving continuously (in loop) data its not able to send . i have got these error ,
1) "Assertion "tcp_receive: valid queue length" failed at line 1191 in ../lwip-2.0.2/src/core/tcp_in.c
Aborted (core dumped)"
2)Assertion "unsent_oversize mismatch (pcb->unsent is NULL)" failed at line 549 in ../lwip-2.0.2/src/core/tcp_out.c
Segmentation fault (core dumped)

if i am providing sleep at the time of sending a data then its working fine but i don't want to use sleep i want send data continuously.
please suggest me ,how can i resolve these issue .
Thanks Team.

Compilation Error

Hello,
I got redefinition errors like:

../lwip-2.0.2/src/include/lwip/inet.h:58:8: error: redefinition of ‘struct in_addr’
   58 | struct in_addr {
      |        ^~~~~~~
In file included from /usr/include/netdb.h:27,
                 from /usr/include/pcap/socket.h:59,
                 from /usr/include/pcap/pcap.h:130,
                 from /usr/include/pcap.h:43,
                 from ../lwip-2.0.2/src/arch/netif.c:29:
/usr/include/netinet/in.h:31:8: note: originally defined here
   31 | struct in_addr
      |        ^~~~~~~
In file included from ../lwip-2.0.2/test/linux/lwip.h:15,
                 from ../lwip-2.0.2/src/arch/netif.c:30:

Can you help me please?

Regards,

Does this port work in Raspberry ?

As Raspberry uses linux (kind of) I wonder if this can be used on Raspberry Pi. I'm not sure if this port is specific of computer hardware.