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Ports go from 0 to 65535. &nbsp;Anything below 1024 is considered &quot;reserved&quot;, and you must be running as root to listen on those ports...
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Ports go from 0 to 65535.  Anything below 1024 is considered "reserved", and you must be running as root to listen on those ports...

why does the apps use big port like 45000?

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developers tend to use socket() call to get a free socket/port for the system, its number is random if not explicitely requested. See man socket, man connect.
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developers tend to use socket() call to get a free socket/port for the system, its number is random if not explicitely requested. See man socket, man connect.

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That's only true for a client program, of course :)<br />
<br />
A server type program wouldn't function very well if the clients didn't know where to find it...<br />

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That's only true for a client program, of course :)

A server type program wouldn't function very well if the clients didn't know where to find it...


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Has your question been answered? &nbsp;If so, please accept one of the above comments as an answer and close this question.
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Has your question been answered?  If so, please accept one of the above comments as an answer and close this question.

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<div class="content wysiwyg-content">
hi,<br />
&nbsp; &nbsp;I notice that application on solaris uses very<br />
high port number, like 35000, when it tries to talk to the server. &nbsp;I have an application running on port 1461,<br />
when the client send a request to the server,<br />
its destination port is 1461, and the source port<br />
is 45009, which 45009 so big? &nbsp;Is there a range<br />
of ports that solaris uses?<br />
<br />
<br />
thanks in advance
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hi,
   I notice that application on solaris uses very
high port number, like 35000, when it tries to talk to the server.  I have an application running on port 1461,
when the client send a request to the server,
its destination port is 1461, and the source port
is 45009, which 45009 so big?  Is there a range
of ports that solaris uses?


thanks in advance

solaris ports usage

Unix is a multitasking, multi-user computer operating system originally developed in 1969 at Bell Labs. Today, it is a modern OS with many commercial flavors and licensees, including FreeBSD, Hewlett-Packard’s UX, IBM AIX and Apple Mac OS-X. Apart from its command-line interface, most UNIX variations support the standardized X Window System for GUIs, with the exception of the Mac OS, which uses a proprietary system.