Re: [lwip-users] TCP not sending initial ACK

[address@hidden]

Chuck Kuecker wrote:
> For what it’s worth, I’ve got TCP_WND and TCP_MSS set to 1200. Other 
> settings seem to cause resends in the body or at the end of the file 
> transfer.
Setting TCP_WND and TCP_MSS to the same value is not a good idea if you 
want to achieve high throughput as you effectively disable the sliding 
window algorithm.
> The timers are all running with the default values set up by the 
> Luminary library. All other communications, ARP, UDP and TCP, work 
> fine – it’s just this file transfer that is strange.
Could you maybe get a wireshark capture and attach it here (pcap format) 
to try to trace the packets in the stack? Maybe the delayed ACK 
mechanism interferes with the used protocol...

Simon