goldsi...@gmx.de wrote > Try setting adding the line "#define LWIP_INLINE_IP_CHKSUM 0" to your > lwipopts.h. Maybe there's something wrong with the checksum-inlining > code on your CPU
Thank you so much Simon. I added above line in my lwipopts.h and it solved the IP checksum error. > (isn't it a 16-bit one?)... Exactly, my box is based on 16-bit microcontroller. So was it the actual cause for this problem? Now with that solution, atleast my webserver for IPv4 again got started. But for IPv6, my box sends RST+ACK for every TCP request. Currently, below is the status of my box: *IP Configurations of my box:* IPv4 address : 10.9.208.210 link-local IPv6 address : fe80::200:21ff:fe12:324 Static IPv6 address : fda8:6c3:ce53:a890::8 *IP config of my PC:* IPv4 address : 10.9.208.127 link-local IPv6 address : fe80::64e4:e351:a09d:5bf4 Static IPv6 address : fda8:6c3:ce53:a890::3 *lwip IPv4+v6 Stack implementation status of my box:* *Ping status:* IPv4-- working IPv6-- working *Webserver Status:* IPv4-- working IPv6-- not working. just sends RST+ACK for evry TCP request. So, now I again came back to my original problem of RST response in case of IPv6. Although ping for IPv6 is working fine. If you can help me in this case then it would be highly appreciated. Here is the packet capture from wireshark addressing this RST+ACK problem in IPv6 webserver case. 07041048_IPv4_v6.pcapng <http://lwip.100.n7.nabble.com/file/n24285/07041048_IPv4_v6.pcapng> Thanks & Regards, Mohsin Kesarani _______________________________________________ lwip-users mailing list lwip-users@ https://lists.nongnu.org/mailman/listinfo/lwip-users -- View this message in context: http://lwip.100.n7.nabble.com/TCP-keeps-re-transmitting-but-no-ACK-packet-after-SYN-SYN-ACK-tp24039p24285.html Sent from the lwip-users mailing list archive at Nabble.com. _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users