Using NETSTAT

This section describes how to use NETSTAT to query the state of TCP/IP devices. This command can be used to quickly verify the status of the SNALINK LU6.2 device and link with relation to the TCP/IP address space.

The NETSTAT DEVLINKS command output displays only information that is known to TCP/IP.

Restriction: The TCP/IP address space must be started before the NETSTAT command can query the connection status.

The NETSTAT DEVLINKS command displays the devices and links that have been defined to the main TCP/IP address space and the status of these devices (whether active or inactive).

Figure 1 shows a sample of output from the NETSTAT DEVLINKS command.

Figure 1. NETSTAT DEVLINKS output example

DevName: SNALU621          DevType: SNALU62          
  DevStatus: Ready                                                
  LnkName: SNALU62L          LnkType: SNALU62     LnkStatus: Ready
    NetNum: 1   QueSize: 0                                        
    BytesIn: 0                     BytesOut: 0                    
    ActMTU: 32764 
  BSD Routing Parameters:                                         
    MTU Size: 00000             Metric: 00                        
    DestAddr: 0.0.0.0           SubnetMask: 255.0.0.0             
  Multicast Specific:                                             
    Multicast Capability: No

The example shows four SNALINK LU6.2 devices and associated links known to TCP/IP.

The most significant field for diagnosing DLC connection problems is the DevStatus field. See z/OS Communications Server: IP Configuration Reference for detailed interpretation of the device status and its importance in the SNALINK LU6.2 DLC connection.