udpdump - Provide a UDP receiver that gets packets from network devices (like Aruba routers) and exports

OriginalAuthor
       Dario Lombardo <lomato[AT]gmail.com>

                                                   2025-06-10                                         UDPDUMP(1)

udpdump is a extcap tool that provides a UDP receiver that listens for exported datagrams coming from any
       source (like Aruba routers) and exports them in PCAP format. This provides the user two basic
       functionalities: the first one is to have a listener that prevents the localhost to send back an ICMP
       port-unreachable packet. The second one is to strip out the lower layers (layer 2, IP, UDP) that are
       useless (are used just as export vector). The format of the exported datagrams are EXPORTED_PDU, as
       specified in https://gitlab.com/wireshark/wireshark/-/raw/master/epan/exported_pdu.h

       To see program arguments:

           udpdump --help

       To see program version:

           udpdump --version

       To see interfaces:

           udpdump --extcap-interfaces

       Exampleoutput

           interface {value=udpdump}{display=UDP Listener remote capture}

       To see interface DLTs:

           udpdump --extcap-interface=udpdump --extcap-dlts

       Exampleoutput

           dlt {number=252}{name=udpdump}{display=Exported PDUs}

       To see interface configuration options:

           udpdump --extcap-interface=udpdump --extcap-config

       Exampleoutput

           arg {number=0}{call=--port}{display=Listen port}{type=unsigned}{range=1,65535}{default=5555}{tooltip=The port the receiver listens on}

       To capture:

           udpdump --extcap-interface=randpkt --fifo=/tmp/randpkt.pcapng --capture

           Note

           To stop capturing CTRL+C/kill/terminate the application.

       udpdump - Provide a UDP receiver that gets packets from network devices (like Aruba routers) and exports
       them in PCAP format.

udpdump is part of the Wireshark distribution. The latest version of Wireshark can be found at
       https://www.wireshark.org.

       HTML versions of the Wireshark project man pages are available at
       https://www.wireshark.org/docs/man-pages.

       --help
           Print program arguments.

       --version
           Print program version.

       --extcap-interfaces
           List available interfaces.

       --extcap-interface=<interface>
           Use specified interfaces.

       --extcap-dlts
           List DLTs of specified interface.

       --extcap-config
           List configuration options of specified interface.

       --capture
           Start capturing from specified interface save saved it in place specified by --fifo.

       --fifo=<path to file or pipe>
           Save captured packet to file or send it through pipe.

       --port=<port>
           Set the listener port. Port 5555 is the default.

       --payload=<type>
           Set the payload of the exported PDU. Default: data.

wireshark(1), tshark(1), dumpcap(1), extcap(4)

udpdump [ --help ] [ --version ] [ --extcap-interfaces ] [ --extcap-dlts ]
       [ --extcap-interface=<interface> ] [ --extcap-config ] [ --capture ] [ --fifo=<path to file or pipe> ]
       [ --port=<port> ] [ --payload=<type> ]