Reference : https://osqa-ask.wireshark.org/questions/20423/pshack-wireshark-capture/ This is basic TCP communications flow. The ACK indicates that a host is acknowledging having received some data, and the PSH,ACK indicates the host is acknowledging receipt of some previous data and also transmitting some more data. Google will let you search for more info about basic TCP communication. ACK means that the machine sending the packet with ACK is acknowledging data that it had received from the other machine. In TCP, once the connection is established, all packets sent by either side will contain an ACK, even if it's just re-acknowledging data that it's already acknowledged. PSH is an indication by the sender that, if the receiving machine's TCP implementation has not yet provided the data it's received to the code that's reading the data (program, or library used by a program), it should do so at that point. To quote RFC 793 , the official specification for...