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Editorial Team
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Asked: 2026-06-06T19:11:36+00:00

I am running the following command on Ubuntu: nc -l -p 5004 -v >>

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I am running the following command on Ubuntu:

nc -l -p 5004 -v  >> /home/anders/Dropbox/netcatFiles/test

which includes a command to make it listen at 5004.

I am sending a RTP-stream to port 5004 using VLC. When I am observing the loopback-interface in Wireshark I notice ICMP-packets with the message ‘Destination unreachable’.

Opening another VLC and telling it to play the incoming data at port 5004, it all works, and the stream is played.

What should I do in order to get Netcat to listen at port 5004?

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1 Answer

  1. Editorial Team

    I think you need to add the ” -u ” parameter to make it listen on UDP.

    By default, netcat works in TCP mode, but RTP protocol is UDP based.

    “The Transmission Control Protocol (TCP), although standardized for
    RTP use,[5] is not normally used in RTP application because TCP favors
    reliability over timeliness. Instead the majority of the RTP
    implementations are built on the User Datagram Protocol (UDP)”

    http://en.wikipedia.org/wiki/Real-time_Transport_Protocol

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