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By passing a negative value to the "mss" argument of "bind" lines, it becomes possible to subtract this value to the MSS advertised by the client, which results in segments smaller than advertised. The effect is useful with some TCP stacks which ACK less often when segments are not full, because they only ACK every other full segment as suggested by RFC1122. NOTE: currently this has no effect on Linux kernel 2.6, a kernel patch is still required to change the MSS of established connections.