Re: [lwip-users] TCP Checksum errors.

[address@hidden]

Nick Thomas wrote:
> But, I still have a real problem, in that the HTTP response doesn't come
> back to the PC based browser.
> It is these responses that wireshark is moaning about, surely not a
> coincidence?
>   
Wireshark may report wrong checksums in packets sent by the PC on which 
wireshark runs - but only by packets sent using the windows internal 
TCPIP stack. So if wireshark reports checksum errors in responses sent 
by the http server on your embedded device back to the PC, these are 
most certainly real checksum errors: I don't know a driver that 
intentionally inserts a wrong checksum into a received frame while 
checking it...

To be sure: if the PC re-sents the same packet again, it is 
retransmitting, which means it didn't get the response and the wireshark 
was not false positive.

Simon