The Netstat command is used to diagnose network problems and control network activity. Once you have selected the options desired and set up any necessary filters, submit the command to the TCP/IP on the MVS host you designated. To view detailed information on each Netstat Command, please refer to the IBM IP User Guide for the appropriate OS/390 release. The pre-formatted Netstat options available through the Commands module are:
All |
Detailed information about TCP/IP connections (TCP/IP address space). Filter: User ID field. |
AllConn |
All connection information including TIME-WAIT and CLOSED connections. Filter: User ID field. |
ARP |
Query ARP cache for a selected address. Offload devices keep their own ARP cache, which you cannot retrieve with NETSTAT ARP. |
ARP All |
Queries the ARP cache for all addresses. Offload devices keep their own ARP cache, which you cannot retrieve with NETSTAT ARP. |
Byteinfo |
Provides connection display information: client ID, bytes sent/received on the connection, local port, foreign port, and state. |
Byteinfo Idletime |
Provides connection display information with the addition of the idle time for this connection in hours:minutes:seconds. |
Cachinfo |
Displays information about Fast Response Cache Accelerator (Cache Accelerator) statistics. For each listening socket configured for Cache Accelerator support, the following information is displayed:
|
Clients |
Provides Current clients information: client ID, authorization, notes handled by client, elapsed time for last used and last forced off, as well as VMCF error count. |
Config |
Displays the following information about the TCP/IP address space for each client:
|
Conn |
Active TCP connections. |
Devlinks |
Lists information for the devices and defined links in the TCP/IP address space: device, type, status, address, queue size, link, type, bytes transmitted/received, net number, BSD parameters, packet trace settings, and ATM specific information. |
Drop |
Drops a connection. |
Gate |
Lists current known gateways: network address, first hop address, link name used by first hop, packet size used by first hop, and subnet mask/value. |
Gate Detail |
Provides the following information about each gateway:
|
Help |
Help on the Netstat command |
Home |
Home address list |
Portlist |
Displays the port reservation list with the following information: · Port number · Protocol · Username · Flags A Autolog D DelayAcks · Optimize MSS R Port is reserved by range S Share port ·
Range: This field is significant only for port entry |
Route |
Displays the following network routing information: · Gateway used in forwarding packets · Flags indicating the route state: D Dynamically created route using a redirect G Gateway route H Host route rather than a network U Route is up · Reference count indicating the current number of active users · Interface is the route’s link name |
SLAP |
Displays all of the service policy definitions (policy rules, policy profiles, and service classes) and policy statistics data |
Sockets |
Clients using socket interface |
TCP |
Details about the TCP/IP address space if the TCP/IP address spaces and NETSTAT are the same version. |
Telnet |
Displays the status of the internal Telnet server. A connection in the listen state is always available for an incoming open request. The following fields are shown:
|
Telnet Detail |
Displays further status detail than the Telnet option of the internal Telnet server. In addition to the fields displayed with the Telnet option, the following three additional fields display:
|
UP |
Date and time TCP/IP was started. |
Vipadyn |
Displays the current dynamic VIPA information for a local host. |
To use the Netstat command under the Expert-Assist Interface, perform the following steps:
1. From the Commands main menu, click the Netstat hyperlink under Communication Server Commands. The Netstat Command screen appears.
Figure 164. NETSTAT Command Screen
2. From the Netstat menu, select one of the Netstat commands. Additional data may be required for certain commands.
3. Click Submit to proceed. The NETSTAT output screen appears.
Figure 165. NETSTAT DevLinks Output Screen
Some additional fields may be required for specific commands:
Address |
The IP address for the resource. Required for the Netstat ARP command. |
Connection ID |
Required for the Netstat Drop command. The Drop command and the associated connection ID fields may not be visible if you do not have the appropriate level of user authority. |
Address Space Name |
Required for the Netstat TCP command. |
4. Do one of the following:
See also: