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Re: [lwip-users] TCP keeps re-transmitting but no ACK packet after SYN,
Re: [lwip-users] TCP keeps re-transmitting but no ACK packet after SYN, SYN+ACK
Sun, 5 Apr 2015 22:23:44 -0700 (MST)
Sergio R. Caprile wrote
>> For ethernet packets, I'm claculating checksum in hardware but for TCP
>> IP, its is in software only.
>>>* My suggestions:*
>>>* 1) Check for this*
>>>* #define CHECKSUM_GEN_IP 1*
>>I checked above Macro in my opt.h and it is set to 1.
> Then you have just found your problem.
> If you are calculating IP checksums in hardware, you must not
> calculate them in lwIP.
> *#define CHECKSUM_GEN_IP 0*
Actually, I don't calculate IP checksums in hardware but in software only as
I mentioned previously which is quoted above.
So, I have set
#define CHECKSUM_GEN_IP 1
Hence, if I set it to 0 then also it is not working and IP checksum comes
out to be 0x000000.
Still I'm unable to find the cause of IP checksum error in my implementation
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- Re: [lwip-users] TCP keeps re-transmitting but no ACK packet after SYN, SYN+ACK,