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    Creative Commons License
    This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
    PyBlosxom

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    Sun, 27 Dec 2015


    /Admin/commandLine/network: Port/Firewall Testing with Netcat and Socat

    To avoid application-related issues and just do a bare-bones test of whether or not a port is open, use netcat or socat. On the server end, turn off the application that should be listening on port 9092, then:

    FOR NETCAT:

    Start listening on the server side:

    netcat -l -p 9092 (newer versions of netcat)
    netcat -l 9092 (older versions)

    Attempt to connect to the port from the client on the other side of the firewall:

    nc IPADDRESS 9092

    If everything is working, anything you type on either end should be mirrored on the other end.

    FOR SOCAT:

    Start listening on the server side:

    socat TCP4-LISTEN:9092,reuseaddr,fork gopen:/tmp/capture,seek-end=0,append

    Now send some text from the client end to the listener:

    date | socat STDIO tcp:localhost:9092

    In this example, the client is on the same machine, replace "localhost" with an IP or DNS if not. All text sent from the client side will be appended to the file /tmp/capture.

    posted at: 02:44 | path: /Admin/commandLine/network | permanent link to this entry