One particular example of sending the RST packet would be in response for a packet received for a closed socket. PUSH packet will tell the receiver to give the data to the application immediately and then it will acknowledge. Receiver will keep the data it get received in a buffer for some time until it gives to the application. In normal flow receiver will not acknowledge each packet after receiving. All the packets after SYN packet will contain have the ACK flag is set. ACK: If this packet contains an acknowledgement value in the acknowledgement field.URG: If it needs to be refered to the urgent pointer field.reserved: Reserved for future use, should be set to zero.Minimum size of the TCP header is 5, 32 bit segments(20 bytes) and maximum is 15 (60 bytes) data offset: Contains the size of the TCP header in 32 bits of segments.One acknowledge number will acknowledge all the bytes sent before it. acknowledgement number: When the ACK flag is set then the value in the acknowledge number field is the next sequence number sender is expecting.It will get incremented by 1 for SYN packets, FIN packets and for each byte of data sent. At the start of the TCP connection (message with SYN flag is set) a random number will get generated as the sequence number. Each endpoint(source and destination) will maintain their sequence number. sequence number: This will keep a track of the ordering of messages.destination port: Port of the host where the request is headed.source port: Port of the host where the request is originated.
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