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Reserved ports - can you use them anyway?

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  • 12-04-2007 10:23pm
    #1
    aidan_walsh
    Closed Accounts Posts: 17,208 ✭✭✭✭


    As long as you have nothing listening on them, there shouldn't be a problem.


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    #2
    pickarooney
    Moderators, Arts Moderators Posts: 35,474 Mod ✭✭✭✭pickarooney


    Is it possible to use, say, port 80 on a server for something other than HTTP?
    Could I, if I wanted to for some reason, assign port 80 to VNC or port 22 for online gaming?


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    #3
    pickarooney
    Moderators, Arts Moderators Posts: 35,474 Mod ✭✭✭✭pickarooney


    Bizarre post-order reversal...
    A not entirely related question - can I tell if someone is connected via ssh to my machine and where the connection originates from?


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    #4
    koloughlin
    Closed Accounts Posts: 97 ✭✭koloughlin


    Something like
    netstat -an | grep 22 | grep ESTABLISHED

    will show you all the connections established to port 22 (if you're using port 22 for ssh).


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    #5
    niallb
    Registered Users Posts: 2,736 ✭✭✭niallb


    netstat -plan | grep ssh | grep ESTABLISHED will show you all ssh connections on any port (if you're using ssh as the binary name) :-)


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    #6
    pickarooney
    Moderators, Arts Moderators Posts: 35,474 Mod ✭✭✭✭pickarooney


    Perfect. Thanks!


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