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Wireshark network packet grabbing tool

2025-01-16 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Internet Technology >

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Relevant answers on the Internet

1) wireshark will preprocess the message, and the degree of the message you see is actually the result of the reorganization

2) disable needs to be set from the Nic to reorganize the packet.

Scene

At present, there is no corresponding instruction on the web page, which can filter out the interested TCP message information. Currently, it can only be filtered by the length of the message content through tcp.len = = 17.

Referenc

Http://packetbomb.com/how-can-the-packet-size-be-greater-than-the-mtu/

Scene

When wireshark grabs a packet, the following content [TCP segment of a reassembled PDU] appears, indicating that the TCP cache data sent by the sender is too large and needs to be sent in fragments. In the process of packet delivery, the Ack (Acknowledgment number) number in the data message sent by the sender remains the same.

Detailed

TCP uses MSS (Maximum Segment Size) in the TCP header of the first message initiating the connection to inform the other side of the maximum message that can be received by the local end (the size of the TCP payload). After receiving a large message in the upper layer, the TCP layer will decompose it into small packets to send.

[TCP Retransmission] if the connection is not available, check whether the firewall of the server is on, so that no data can be received, and the client connection fails.

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