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Determining Initial TCP window size value There are several factors which affect the initial TCP window size: So, if the maximum size of the receive buffer, tcp_rmem, is set to 4194304, the scale factor will be 7. To give you the knowledge you need the instant it becomes available, these articles may be presented in a raw and unedited form.
It normally happens when resuming the laptop from hibernation state, after lets say a minute or two.
Thus, SYNs and application bytes (and FINs, which we will see later) are reliably delivered.
This is not very surprising, as TCP is a significantly more complicated protocol that must keep each end of the connection informed (synchronized) about the current state. Each TCP header contains the source and destination port number.
These two values, along with the source and destination IP addresses in the IP header, uniquely identify each connection.
The field identifies the byte in the stream of data from the sending TCP to the receiving TCP that the first byte of data in the containing segment represents.
If we consider the stream of bytes flowing in one direction between two applications, TCP numbers each field for short) contains the next sequence number that the sender of the acknowledgment expects to receive.