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

From: address@hidden
Subject: Re: [lwip-users] TCP not sending initial ACK
Date: Fri, 28 Aug 2009 11:53:21 +0200
User-agent: Thunderbird (Macintosh/20090812)

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...


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