What are the alternatives for checking open ports, besides telnet?

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2
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we can use the following in order to test telnet VIA port
as the following example we test port 6667



[root@kafka03 ~]# telnet kafka02 6667
Trying 103.64.35.86...
Connected to kafka02.
Escape character is '^]'.
^CConnection closed by foreign host


since on some machines we cant use telnet , from internal reasons



then we want know what are the alternative to check post as telnet






linux rhel curl telnet







share|improve this question



























    up vote
    2
    down vote

    favorite












    we can use the following in order to test telnet VIA port
    as the following example we test port 6667



    [root@kafka03 ~]# telnet kafka02 6667
    Trying 103.64.35.86...
    Connected to kafka02.
    Escape character is '^]'.
    ^CConnection closed by foreign host


    since on some machines we cant use telnet , from internal reasons



    then we want know what are the alternative to check post as telnet






    linux rhel curl telnet







    share|improve this question

























      up vote
      2
      down vote

      favorite









      up vote
      2
      down vote

      favorite











      we can use the following in order to test telnet VIA port
      as the following example we test port 6667



      [root@kafka03 ~]# telnet kafka02 6667
      Trying 103.64.35.86...
      Connected to kafka02.
      Escape character is '^]'.
      ^CConnection closed by foreign host


      since on some machines we cant use telnet , from internal reasons



      then we want know what are the alternative to check post as telnet






      linux rhel curl telnet







      share|improve this question















      we can use the following in order to test telnet VIA port
      as the following example we test port 6667



      [root@kafka03 ~]# telnet kafka02 6667
      Trying 103.64.35.86...
      Connected to kafka02.
      Escape character is '^]'.
      ^CConnection closed by foreign host


      since on some machines we cant use telnet , from internal reasons



      then we want know what are the alternative to check post as telnet






      linux rhel curl telnet




      linux rhel curl telnet






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 9 mins ago









      steve

      13.4k22251




      13.4k22251










      asked 4 hours ago









      yael

      2,1511650




      2,1511650




















          1 Answer
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          up vote
          4
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          netcat is one option. 



          nc -zv kafka02 6667



          • -z = sets nc to simply scan for listening daemons, without actually sending any data to them


          • -v = enables verbose mode





          share|improve this answer




















          • is it possible to get standard output from the nc ? because I want to write in in my bash script
            – yael
            4 hours ago










          • Read the documentation! Without options nc behaves a lot like telnet.
            – Henrik
            3 hours ago










          • yes I read the docs but -w flag not works as timeout
            – yael
            3 hours ago










          • example - c -v -w 1 kafka01 6667 ( we not get timeout )
            – yael
            3 hours ago










          • nc -v -w 3 kafka01 6667 Ncat: Version 6.40 ( nmap.org/ncat ) Ncat: Connected to 10.164.235.85:6667. ( this still hang )
            – yael
            3 hours ago











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          1 Answer
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          up vote
          4
          down vote













          netcat is one option. 



          nc -zv kafka02 6667



          • -z = sets nc to simply scan for listening daemons, without actually sending any data to them


          • -v = enables verbose mode





          share|improve this answer




















          • is it possible to get standard output from the nc ? because I want to write in in my bash script
            – yael
            4 hours ago










          • Read the documentation! Without options nc behaves a lot like telnet.
            – Henrik
            3 hours ago










          • yes I read the docs but -w flag not works as timeout
            – yael
            3 hours ago










          • example - c -v -w 1 kafka01 6667 ( we not get timeout )
            – yael
            3 hours ago










          • nc -v -w 3 kafka01 6667 Ncat: Version 6.40 ( nmap.org/ncat ) Ncat: Connected to 10.164.235.85:6667. ( this still hang )
            – yael
            3 hours ago















          up vote
          4
          down vote













          netcat is one option. 



          nc -zv kafka02 6667



          • -z = sets nc to simply scan for listening daemons, without actually sending any data to them


          • -v = enables verbose mode





          share|improve this answer




















          • is it possible to get standard output from the nc ? because I want to write in in my bash script
            – yael
            4 hours ago










          • Read the documentation! Without options nc behaves a lot like telnet.
            – Henrik
            3 hours ago










          • yes I read the docs but -w flag not works as timeout
            – yael
            3 hours ago










          • example - c -v -w 1 kafka01 6667 ( we not get timeout )
            – yael
            3 hours ago










          • nc -v -w 3 kafka01 6667 Ncat: Version 6.40 ( nmap.org/ncat ) Ncat: Connected to 10.164.235.85:6667. ( this still hang )
            – yael
            3 hours ago













          up vote
          4
          down vote










          up vote
          4
          down vote









          netcat is one option. 



          nc -zv kafka02 6667



          • -z = sets nc to simply scan for listening daemons, without actually sending any data to them


          • -v = enables verbose mode





          share|improve this answer












          netcat is one option. 



          nc -zv kafka02 6667



          • -z = sets nc to simply scan for listening daemons, without actually sending any data to them


          • -v = enables verbose mode






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 4 hours ago









          steve

          13.4k22251




          13.4k22251











          • is it possible to get standard output from the nc ? because I want to write in in my bash script
            – yael
            4 hours ago










          • Read the documentation! Without options nc behaves a lot like telnet.
            – Henrik
            3 hours ago










          • yes I read the docs but -w flag not works as timeout
            – yael
            3 hours ago










          • example - c -v -w 1 kafka01 6667 ( we not get timeout )
            – yael
            3 hours ago










          • nc -v -w 3 kafka01 6667 Ncat: Version 6.40 ( nmap.org/ncat ) Ncat: Connected to 10.164.235.85:6667. ( this still hang )
            – yael
            3 hours ago

















          • is it possible to get standard output from the nc ? because I want to write in in my bash script
            – yael
            4 hours ago










          • Read the documentation! Without options nc behaves a lot like telnet.
            – Henrik
            3 hours ago










          • yes I read the docs but -w flag not works as timeout
            – yael
            3 hours ago










          • example - c -v -w 1 kafka01 6667 ( we not get timeout )
            – yael
            3 hours ago










          • nc -v -w 3 kafka01 6667 Ncat: Version 6.40 ( nmap.org/ncat ) Ncat: Connected to 10.164.235.85:6667. ( this still hang )
            – yael
            3 hours ago
















          is it possible to get standard output from the nc ? because I want to write in in my bash script
          – yael
          4 hours ago




          is it possible to get standard output from the nc ? because I want to write in in my bash script
          – yael
          4 hours ago












          Read the documentation! Without options nc behaves a lot like telnet.
          – Henrik
          3 hours ago




          Read the documentation! Without options nc behaves a lot like telnet.
          – Henrik
          3 hours ago












          yes I read the docs but -w flag not works as timeout
          – yael
          3 hours ago




          yes I read the docs but -w flag not works as timeout
          – yael
          3 hours ago












          example - c -v -w 1 kafka01 6667 ( we not get timeout )
          – yael
          3 hours ago




          example - c -v -w 1 kafka01 6667 ( we not get timeout )
          – yael
          3 hours ago












          nc -v -w 3 kafka01 6667 Ncat: Version 6.40 ( nmap.org/ncat ) Ncat: Connected to 10.164.235.85:6667. ( this still hang )
          – yael
          3 hours ago





          nc -v -w 3 kafka01 6667 Ncat: Version 6.40 ( nmap.org/ncat ) Ncat: Connected to 10.164.235.85:6667. ( this still hang )
          – yael
          3 hours ago


















           

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