I don't really understand the relation between the traffic sent and the traffic captured. I also run this one in the client: tcpdump -i 2 src 10.60.0.113 Packets: 24418 Between first and last: 2575.64 ms Avg. These are the complete statistics of the capture:įirst Packet Time: 20-06-20 02:42:23 Last Packet Time: 20-06-20 In the pcap file there are 24418 packets. I start capturing with tshark a bit earlier than I run the iperf commands and finish a bit later, but I'm using the capture filter: The output from the client command is: Connecting to host 10.60.0.113, port 5200 Reverse mode, remote hostġ0.60.0.113 is sending local 10.60.0.2 port 33929 connected to 10.60.0.113 port 5200 protocol: TCP num_streams: 1 blksize: 131072 omit: 2 duration: 0 bytes However, if you know the UDP port used (see above), you could filter on that one however, as a TFTP server will choose a unique port number from which to send the reponse, and will send it to the port number from which the request came, which is not likely to be a well known port number, a filter checking for UDP port 69 will capture only the initial TFTP request, not the response to that request or any subsequent packets in that TFTP conversation.I'm using iperf3 to send 1005 TCP packets with the commands: iperf3 -s -i 1 -f m -p 5200 -D
You cannot directly filter TFTP protocols while capturing. Show only the TFTP based traffic: tftp Capture Filter Display FilterĪ complete list of TFTP display filter fields can be found in the display filter reference SampleCaptures/tftp_wrq.pcap Capture of a TFTP Write Request. SampleCaptures/tftp_rrq.pcap Capture of a TFTP Read Request. There are no TFTP specific preference settings. XXX - Add example traffic here (as plain text or Wireshark screenshot). The well known UDP port for TFTP traffic is 69. UDP: Typically, TFTP uses UDP as its transport protocol.XXX - add a brief description of TFTP history Protocol dependencies
Sometimes TFTP is also used to upload firmware files from the user to an embedded device, but as these devices become more and more advanced, HTTP is more often used for this purpose today. thin clients) to get files from a server at bootup time (typically in conjunction with BOOTP). Because of this, it's often used in embedded devices (e.g. TFTP is used to transfer files in a very simple way.Ĭompared to other file transfer protcols (like: FTP or HTTP), TFTP is much simpler (and much smaller in code size) and therefore easier to implement. In short, the above command will capture all traffic on the Ethernet device and write it to a file named tcpdump.pcap in a format compatible with Wireshark.
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