Binding the port number. Post: 302338588

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Special Forums IP Networking Binding the port number. Post 302338588 by vijaypdp2006 on Tuesday 28th of July 2009 10:40:01 AM

07-28-2009

Registered User

Hi,

We can use the same port number for two applications based on protocols.(i.e one application is based on TCP and the other application based on UDP).

But i don't know about interfaces, can anyone one help........

1) Can we use same port number for different applications on a single interface.

2) Can we use same port number for different applications on different interfaces(interfaces have separate ip address).

Consider that same port number can be used on different applications, then won,t it be a problem in receiving the packets.

Applications using UDP protocol.
--------------------------------

1) Application 1 is binded to the port number 1500 and ip address of an interface.(Transfer the packet through the selected interface).

2) Application 2 is binded to the port number 1500 and ip address is 0.0.0.0

Now, inorder to transfer the packet of Application 2 an interface has to be selected based on destination's ip address.
If application 2 want's to transfer packets with different destination ip adresses, then different interfaces will be selected for different interfaces.(so application 2 may transfer packet through any one of the available interface and where as application 1 will transfer through the specific interface).

--->After receiving the packet, how should i select the socket of application 1 and application 2.

Problem is both sockets are binded to same port number and interface on which application 2 is transferring the packets are not fixed.

Last edited by vijaypdp2006; 07-28-2009 at 11:58 AM..

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LEARN ABOUT CENTOS

axports

AXPORTS(5)						     Linux Programmer's Manual							AXPORTS(5)

NAME

       /etc/ax25/axports - AX.25 port configuration file.

DESCRIPTION

       axports	is an ASCII file that contains information about each of the physical AX.25 ports that are to be used.	When dealing with an AX.25
       utility such as call, it takes an argument that is the port name.  This port name is a reference to the line within axports, which has that
       name  as  its  first argument.  The information on each line contains enough information to bind the command to a particular physical AX.25
       interface, this binding is done by matching the callsign on the line in axports with the callsign of the port set by kissattach.

       The lines within axports must either be a comment line, which starts with a # in the first column, or a port description in  the  following
       format, each field being delimited by white space:

	      name callsign speed paclen window description

       The field descriptions are:

	      name	    is	the  unique identifier of the port.  This is the name given as the port argument of many of the AX.25 support pro-
			    grams.  This is not in any way related to actual device identities, just unique

	      callsign	    the callsign of the physical interface to bind to.

	      speed	    this is the speed of interface, a value of zero means that no speed will be set by kissattach(8).

	      paclen	    is the default maximum packet size for this interface.

	      window	    the default window size for this interface.

	      description   a free format description of this interface, this field extends to the end of the line. This field may contain spaces.

FILES

       /etc/ax25/axports

SEE ALSO

       call(1), ax25(4), axparms(8), kissattach(8).

Linux								    2008-Feb-04 							AXPORTS(5)