Blog

• The PSH flag in the TCP header informs the receiving host that the data should be pushed up to the receiving application immediately. Please be noted that the PUSH flag is usually set on the last segment of a file to prevent buffer deadlocks.

• 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.

• TCP Retransmission – This is a plain-Jane retransmission. Wireshark observed a packet in a TCP conversation with a sequence number and data, and later observed another packet with the same sequence number and data. These are typically sent after a retransmission timer expires in the sender.

Wireshark is a network protocol analyzer, or an application that captures packets from a network connection, such as from your computer to your home office or the internet. Packet is the name given to a discrete unit of data in a typical Ethernet network. Wireshark is the most often-used packet sniffer in the world.

The PSH flag in the TCP header informs the receiving host that the data should be pushed up to the receiving application immediately. Please be noted that the PUSH flag is usually set on the last segment of a file to prevent buffer deadlocks.

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.

TCP Retransmission – This is a plain-Jane retransmission. Wireshark observed a packet in a TCP conversation with a sequence number and data, and later observed another packet with the same sequence number and data. These are typically sent after a retransmission timer expires in the sender.