On TCP Listeners resources in NetMaster 13.0

Products

• NetMaster Network Management for TCP/IP

Issue/Introduction

This article provides product plus additional information about the NetMaster 13.0 TCP Listeners resources.

Environment

OS:  z/OS.

Cause

 

Resolution

We follow these steps to access the TCP Listeners screen in NetMaster 13.0--starting at the NetMaster main menu:

 

M     Monitors

I       IP Resource Monitor

?      in front of the stack name or in front of the address space name

s      IL        List TCP Listeners   Note:  The help says:  IL displays TCP Listeners (ASMON, STACK)

 

ZZZZZZZZ------------------ TCP/IP : TCP Listeners ---------------Stack: ZZZZZZZ
 Command ===>                                                   Scroll ===> CSR
 
     Line 1 of 326                                Refresh Every ...      Seconds
                                       SD=View Details PT=Packet Trace ?=Actions
     Local                                       Total  Current
     Host            LPort  TaskName  Active  Accepted  BackLog   Idle
     *                  21  FTPD111        2      3578        0    0:00:50
     *                  22  SSHD           0         0        0     111:44
     *                  22  SSHD           8     16804        0    0:00:18
     *                  23  TCPTEL         9      1159        0    0:09:14
etc.

 

Note:  ZZZZZZZ is a mask for the stack name 

Note:  ZZZZZZZZ is a mask for the NM system name

-

 

Note:  On this screen F11=Right is available once

Note:  The actions are SD=View Details PT=Packet Trace ?=Actions

-   

 

We can also use NM shortcut /ASMON... IL:  Displays the current state of active TCP listeners that are associated with an address space.  

-

 

Please review the following additional information:

 

TCP Listeners are network application components that monitor specific IP addresses and ports for incoming TCP connection requests, acting as a server to receive data. 

They enable communication between clients and servers by accepting requests, managing the connection handshake, and passing data to the application. 

-

 

Key characteristics of TCP Listeners include:

-- Functionality: They initiate the connection by listening for incoming packets, accepting them, and often passing them to a handler.

-- Key Components: They rely on TCP/IP network configuration and are used in both software applications (e.g., C# TcpListener) and network infrastructure (e.g., load balancers).

-- Common Use Cases: They are essential for setting up web servers, IoT devices receiving messages, and backend listeners in load balancers for handling SSH or HTTP traffic.

-- Configuration: Typically configured to listen on a specific port and IP address, they can manage concurrent connections and set backlog limits for handling high traffic.

 

Additional Information

NetMaster 13.0 Tech Docs space:  NetMaster 13.0 .