Wireshark is a protocol analyser available for download. Scott Reeves shares the wireshark filters that helps you isolate TCP and UDP traffic. The relationship between the port numbers in a packet that is sent and one that is a reply is that the destination port of the sent packet will be the source on the other end, and the source of the reply will be the destination of the original packet.Two simple filters for wireshark to analyze TCP and UDP traffic Packet to be sent in response to a first packet, the sender of the first packet shouldīe the destination of the second packet). The second UDP packet is a reply to this first UDP packet. Examine a pair of UDP packets in which your host sends the first UDP packet and The protocol number for UDP is 17 in decimal which is 0x11 in hex.ħ. To answer this question, you’ll need to look into the Protocolįield of the IP datagram containing this UDP segment (see Figure 4.13 in the text, What is the protocol number for UDP? Give your answer in both hexadecimal andĭecimal notation. The largest possible source port is 2^16 bytes.Ħ. What is the largest possible source port number? (Hint: see the hint in 4.) The largest possible amount of bytes that can be in a UDP payload is (2^16 – 8) bytes.ĥ. (Hint: the answer to this question can be determined by your answer to 2. What is the maximum number of bytes that can be included in a UDP payload? This length field is the value of the header plus all the data in the packet.Ĥ. Verify your claim with your captured UDP packet. The value in the Length field is the length of what? (You can consult the text for This packet, determine the length (in bytes) of each of the UDP header fields.Įach field in the header was two bytes long.ģ. By consulting the displayed information in Wireshark’s packet content field for They are source, destination, length, and checksum.Ģ. These questions directly from what you observe in the packet trace.) Name these
(You shouldn’t look in the textbook! Answer From this packet, determine how manyįields there are in the UDP header.
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