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Full Discussion: How to check empty port using netstat?
Top Forums Shell Programming and Scripting How to check empty port using netstat? Post 302911510 by rbatte1 on Friday 1st of August 2014 06:10:47 AM
Old 08-01-2014
Probably easier to list those that do have services and then work backwards:-
Code:
netstat -na | grep LISTEN

Also it would be well worth checking in /etc/services that the port is not allocated to something that may periodically pop up and do something. Perhaps you have an application that uses port 12345 during the online day for a business user GUI, but switches to 54321 overnight for the batch monitoring team. If you have a look and decide to use 54321, then you might inhibit the overnight work.

Of course, it depends how your application is written as to whether it will be easy to determine which ports are always free.



Robin
 

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LEARN ABOUT X11R4

inet_type

inet_type(4)                                                       File Formats                                                       inet_type(4)

NAME

       inet_type - default Internet protocol type

SYNOPSIS

       /etc/default/inet_type

DESCRIPTION

       The inet_type file defines the default IP protocol to use. Currently this file is only used by the ifconfig(1M) and netstat(1M) commands.

       The  inet_type  file  can  contain  a  number of <variable>=<value> lines. Currently, the only variable defined is DEFAULT_IP, which can be
       assigned a value of IP_VERSION4, IP_VERSION6, or BOTH.

       The output displayed by the ifconfig and netstat commands can be controlled by the value of DEFAULT_IP set in inet_type file.  By  default,
       both commands display the IPv4 and IPv6 information available on the system. The user can choose to suppress display of IPv6 information by
       setting the value of DEFAULT_IP.  The following shows the possible values for DEFAULT_IP and the resulting ifconfig and netstat output that
       will be displayed:

       IP_VERSION4     Displays only IPv4 related information. The output displayed is backward compatible with older versions of the ifconfig(1M)
                       and netstat(1M) commands.

       IP_VERSION6     Displays both IPv4 and IPv6 related information for ifconfig and netstat.

       BOTH            Displays both IPv4 and IPv6 related information for ifconfig and netstat.

       The command-line options to the ifconfig and netstat commands override the effect of DEFAULT_IP as set in the inet_type file. For  example,
       even if the value of DEFAULT_IP is IP_VERSION4, the command

       example% ifconfig -a6

       will display all IPv6 interfaces.

EXAMPLES

       Example 1: Suppressing IPv6 Related Output

       This is what the inet_type file must contain if you want to suppress IPv6 related output:

       DEFAULT_IP=IP_VERSION4

SEE ALSO

       ifconfig(1M), netstat(1M)

SunOS 5.10                                                          16 Jun 1999                                                       inet_type(4)
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