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Best way to calculate zero window recovery time

Hi,

I often see that one end will send multiple zero window packets before it sends a non zero window update. For example when calculating recovery time should I take the delta between the first outbound zero window and the first outbound non zero window update or the last outbound zero window and the first non zero window outbound? It seems that it should be the first to me but then at times the delay is quite high.

cheers