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b90a54f989
This commit changes ssthresh to be the largest effective congestion window (amount of in-flight data). This follows the guidance of RFC 5681 which recommends setting ssthresh arbitrarily high. LwIP was previously using the receive window value at the end of the 3-way handshake and in the case of an active open where the receiver used window scaling and/or window auto-tuning, this resulted in a very small ssthresh value even though the window ramped up once the connection was established