haohd/lwip-linux

Too many duplicate ACK with ECHO_SERVER example

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My environment is Multipass Ubuntu 22.04, on macOS Monterey. Echo server example seems to work just fine over telnet, but I am seeing lots of duplicate ACKs on Wireshark capture. Just sending one message "hello", there are about 4000 lines of duplicate ACKs. Please see screenshot attached:

Screen Shot 2023-10-08 at 10 36 49 PM