/// The endpoint has received a SYN (synchronize) segment and has sent a SYN-ACK /// (synchronize-acknowledgment) segment in response. It is awaiting an ACK (acknowledgment) /// segment from the remote endpoint. SynRcvd, /// The connection is established, and both endpoints can send and...
TCP handshake waved schematic diagram: TCP window control and retransmission control In the use of window control, if there is a segment loss, first consider the situation that the confirmation response fails to return. In this case, the data has arrived at the opposite end, and there is...
因为有部分segment正在路上,还没有收到receiver的ackno,所以应该假设这部分segment可以顺利到达,给他们提前留出空间,所以判断逻辑应该是:window_size > bytes_in_flight(),另外,min(TCPConfig::MAX_PAYLOAD_SIZE, window_size - bytes_in_flight())也是我们下一次应该发送的字节数~...
Draw a picture of the teardown in your trace, starting from when the first FIN or RST is issued until the connection is complete. As before, show the sequence and ACK numbers on each segment. If you have FINs then use the time difference to estimate the round-trip time. 在wireshark中...
TIME_WAIT 状态持续2MSL时间,MSL就是maximum segment lifetime(最大报文段的生命期),这是一个IP数据包能在互联网上生存的最长时间,超过这个时间将在网络中消失(被丢弃)。RFC 793中规定MSL为2分钟,实际应用中,可能为30S,1分钟,2分钟。 我的系统是ubuntu,输入如下命令后可以看到,时间为60秒 请注意两个状态,一个...
Each TCP segment has a header and a payload. The payload is the actual data chunk to be transmitted. The TCP segment header first and foremost contains the source and destination port number – the source and destination addresses are already present in the IP header. ...
Remember that the TCP header’s length is always required to be a multiple of 32 bits because the TCP Header Length field uses that unit. The EOL option indicates the end of the list and that no further processing of the options list is to be performed. Maximum Segment Size (MSS) Op...
(SYN,SYN-ACK,ACK)SYNchronize andACKnowledge messages are indicated by a bit inside the header of theTCPsegment.TCPknows whether thenetworkTCPsocket connection is opening, synchronizing, establishedby using theSYNchronize andACKnowledge messages when establishing anetworkTCPsocket connection.When the ...
A TCP sender computes a value based on the contents of the TCP header and data fields. This 16-bit value will be compared with the value the receiver generates using the same computation. If the values match, the receiver can be very confident that the segment arrived intact. ...