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I'm trying to send a broadcast message using netcat.
I have firewalls open and sending a regular message like this works for me:
host: nc -l 192.168.1.121 12101 client: echo "hello" | nc 192.168.1.121 12100 But I can't get something like this to work.
host: nc -lu 0.0.0.0 12101 client: echo "hello" | nc -u 255.255.255.255 12100 Am I using the right flags? Note, the host is on Mac and the client on Linux. Can you give me an example that works for broadcasting a message?
Thanks!
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Sending Files through Netcat This works by setting the Netcat to listen on a specific port (using the -l option) on the receiving host and then establishing a regular TCP connection from the other host and sending the file over it.
The Netcat ( nc ) command is a command-line utility for reading and writing data between two computer networks. The communication happens using either TCP or UDP. The command differs depending on the system ( netcat , nc , ncat , and others).
Netcat (or nc in short) is a simple yet powerful networking command-line tool used for performing any operation in Linux related to TCP, UDP, or UNIX-domain sockets.
The GNU version of netcat might be broken. (I can't get to work under 0.7.1 anyway.) See http://sourceforge.net/p/netcat/bugs/8/
I've gotten socat to work. Code below does UDP broadcast to port 24000.
socat - UDP-DATAGRAM:255.255.255.255:24000,broadcast (In socat-world "-" means "stdin".)
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