![]() ![]() So, wireshark uses a colelction of mechanisms to determine which protocol it should use to dissect the data. Trigger Notifications based on certain Traffic received. Provide Dashboard/Graphs to display N/W Traffic. Provided Life Capture and also save a Packet Capture for further analysis. If not, it will tell Wireshark to try another dissector. Verify is Specific Ports/Traffic is being blocked by N/W device Firewall. They will examine the payload of the packet to determine if the data matches its protocol specification, if so, it will dissect the packet. So wireshark then adds a conversation with the ports from the port command to make sure the session will be interpreted as ftp-data. Like the FTP PORT command will indicate that a new TCP session will be created which should be treated as FTP-DATA. Sometimes dynamic dissecting is done by examining packets which will hint that a new session will arrive. If a packet does not belong to a conversation, the destination port will be examined first as the biggest chance is that it is a request and then the destination port is linked to the protocol in use (yes, UDP and TCP dissectors will register themselves to port numbers). It will try to map a packet to a conversation. Since there are two ports, wireshark has some rules to determine which port to follow. Examples are 1 for ICMP, 6 for TCP and 17 for UDP.Īssuming UDP, the UDP dissector will dissect the UDP header and will look at the ports to determine which dissector it will send the payload to. The IP dissector will dissect all the IP headers and will look at the "protocol" field to determine which dissector to pass the payload to. So assuming IP, wireshark will call the IP dissector passing along the payload from the ethernet frame. Examples are 0x0806 for ARP or 0x0800 for IP. The ethertype will point to the protocol that was carried in the ethernet frame. Wireshark will dissect the destination and source mac address and then it will read the ethertype field (assuming it is a Ethernet-II frame, which is the most common). It then knows which protocol to use for the dissection of the first octets in the packet. First of wireshark read the link layer type from the interface it is capturing from. About the same way your system is recognizing which process to send the received packets to. ![]()
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