How do I know what traffic is in network port?

 
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Special Forums UNIX and Linux Applications Infrastructure Monitoring How do I know what traffic is in network port?
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Old 02-18-2014
How do I know what traffic is in network port?

If I would like to know what connection , data , traffic in a network port ( eth0 ) , what can I do ?

ps. because I always found the network is very slow , so I would like what the network port is doing .

Thanks
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RSUPLNK(8)						     Linux Programmer's Manual							RSUPLNK(8)

NAME
rsuplnk - User entry into the ROSE network. SYNOPSIS
rsuplnk [-q] <port> DESCRIPTION
The rsuplnk program allows a user to gain entry into the ROSE network using the standard pseudo-digipeating method. Recent Linux kernels are aware of this form of operation and the ax25d program can listen for such connections. The normal mode of operation of a ROSE switch is to have one ROSE address (ie port) per physical AX.25 port. Therefore ROSE users coming in on a given AX.25 port will appear as if they come from the associated ROSE port. This is the reason for the need for a ROSE port as an argument. To use rsuplnk you need an entry in ax25d.conf to listen for incoming connections. In the example below, I will be listening for ROSE con- nections on my AX.25 port 144 using the callsign KE4GAJ-10 and the ROSE port associated with the AX.25 port is rs144. # [KE4GAJ-10* VIA 144] NOCALL * * * * * * L default * * * * * * - root /usr/sbin/rsuplnk rsuplnk rs144 # There would typically be one rsuplnk per user access AX.25 port. The associated program for exiting a ROSE network is rsdwnlnk. All errors generated by rsuplnk are written to the system debug log file. OPTIONS
-q Supresses the messages generated by rsuplnk when making the connection. FILES
/etc/ax25/rsports SEE ALSO
rose(4), ax25d.conf(5), ax25d(8), rsdwnlnk(8), rose_call(8). AUTHOR
Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk> Linux 29 April 1997 RSUPLNK(8)