Diagnose Network Problems

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Diagnose Network Problems

Although the IP resource and node monitors have display commands to help you diagnose problems, additional diagnostic functions are available from the Network Diagnosis : Primary Menu.

To access diagnostic functions

From the NetMaster : Primary Menu, enter D (IP Network Diagnosis).
The Network Diagnosis : Primary Menu appears.
Select C (Connections (IP, Telnet)).
The Connections panel appears.
Select CF (List Connections (Advanced)).
The Connection List Criteria panel appears.

Press F6 (Action).

The Connections (Advanced) panel appears. This panel lists active connections. You can press F11 to display columns to the right.

PROD-------------- TCP/IP : Connections (Advanced) -----------Stack: *MULTIPLE* Command ===> Scroll ===> PAGE Line 35 of 315 Refresh Every ... Seconds S=View I=Information CS=Statistics PT=Packet Trace Z=Drop ?=Actions Foreign Local LU Host Port Host LPort Name User ID TaskName 172.24.122.116 2865 172.24.172.8 1023 T01V0069 USER01 TCPIP01 172.24.3.10 50004 172.24.172.8 1041 - - - 172.24.206.195 2049 172.24.172.8 1079 - - MVSNFSC 172.24.206.195 2049 172.24.172.8 1096 - - MVSNFSC 172.24.206.195 2049 172.24.172.8 1179 - - MVSNFSC 172.24.151.147 1382 172.24.172.8 1202 - - CCITCP 172.24.151.147 1393 172.24.172.8 1202 - - CCITCP 172.24.151.147 1385 172.24.172.8 1202 - - CCITCP 172.24.151.162 1369 172.24.172.8 1202 - - CCITCP 172.24.66.4 7005 172.24.172.8 3202 - - CCITCPG2 172.24.66.61 7005 172.24.172.8 3203 - - CCITCPG2 172.24.80.194 65535 172.24.172.8 3396 - - PROD 172.24.80.194 65535 172.24.172.8 3397 - - PROD 172.24.66.11 7031 172.24.172.8 3398 - - PROD 172.24.200.72 6664 172.24.172.8 3399 - - PROD F1=Help F2=Split F3=Exit F6=Refresh F7=Backward F8=Forward F9=Swap F11=Right F12=Traces

From this panel, you can perform actions such as ping, traceroute and packet trace, or you can simply review the details of a connection.

To display packet and byte statistics

Enter CS (Statistics) next to a connection.

The Connection Statistics panel appears.

PROD------------------- TCP/IP : Connection Statistics ------------------------ Command ===> Scroll ===> CSR Connection Details Local IP address:port ................. 172.24.17.12:1023 Remote IP address:port ................ 172.24.172.123:2865 Connection state ...................... ESTABLISHED Connection started .................... 21-OCT-2009 17:45:14 Turn count ............................ 27 Bytes Bytes Packets Packets Statistics for last 5 minutes In Out In Out 20.44 0 0 0 0 20.43 156 304 2 2 20.42 116 304 1 2 20.41 156 304 2 2 20.40 156 304 2 2 Bytes Bytes Packets Packets Statistics for last hour In Out In Out 20.45 428 912 5 6 20.40 700 1520 8 10 20.35 660 1520 7 10 20.30 660 1520 7 10 20.25 620 1520 6 10 20.20 700 1520 8 10 20.15 660 1520 7 10 20.10 700 1520 8 10 20.05 660 1520 7 10 20.00 700 2036 8 11 19.55 900 4616 13 16 19.50 700 1520 8 10 Bytes Bytes Packets Packets Connection duration In Out In Out Total ..................... 28150 111K 345 445 Payload only .............. 14342 93531 - -

This panel enables you to display packet and byte statistics for a specific IP connection. You can refresh this display (F6), or display basic information together with packet-specific data from both the local and remote perspective (F12).

Statistics for last 5 minutes: Shows byte and packet counts in 1-minute intervals for the last 5 minutes.
Statistics for last hour: Shows byte and packet counts in 5-minute intervals for the last hour.
Connection duration: Shows byte and packet counts since the connection was started.

Press F3 (Exit).
You return to the Connections (Advanced) panel.

To perform a packet trace

Identify a connection that has packets flowing, that is, there is activity in the Bytes Out and Bytes In columns.
Enter PT (Activate Packet Trace) next to the connection, and wait for a few seconds to collect packets.
The packets are traced for this connection.

Enter PTV (View Packet Trace) next to the connection.

The most recent packets on the connection are listed.

 PROD--------------------- SmartTrace : Packet List ----------------------------
 Command ===>                                                   Scroll ===> CSR 
                                                                                
                                                                S/V=View P=Print
     Stack ......... TCPIP01              Total Traced 44                       
     Local Host .... 172.24.151.162  <--> Foreign Host 172.24.172.8             
     Local Port .... 1369                 Foreign Port 1202                     
     Protocol ...... TCP                                                        
                                                                                
          Dir  +Time  Bytes  Summary Information                                
     0001  -> <0.001   1492  Ack     Win=65535 Seq=1412574111 Ack=2241384874    
     0002  -> <0.001   1232  Ack Psh Win=65535 Seq=1412575563 Ack=2241384874    
     0003  -> <0.001   1492  Ack     Win=65535 Seq=1412576755 Ack=2241384874    
     0004  -> <0.001   1492  Ack     Win=65535 Seq=1412578207 Ack=2241384874    
     0005  -> <0.001   1232  Ack Psh Win=65535 Seq=1412579659 Ack=2241384874    
     0006  -> <0.001   1492  Ack     Win=65535 Seq=1412580851 Ack=2241384874    
     0007  -> <0.001   1155  Ack Psh Win=65535 Seq=1412582303 Ack=2241384874    
     0008 <-   0.044     40  Ack     Win=65535 Seq=2241384874 Ack=1412571467    
     0009 <-  <0.001     40  Ack     Win=65535 Seq=2241384874 Ack=1412575563    
     0010 <-  <0.001     40  Ack     Win=65535 Seq=2241384874 Ack=1412580851    
     0011 <-   0.001     40  Ack     Win=65535 Seq=2241384874 Ack=1412583418    
     0012 <-   0.037    516  Ack Psh Win=65535 Seq=2241384874 Ack=1412583418    
     0013  ->  0.222     40  Ack Psh Win=65535 Seq=1412583418 Ack=2241385350    
     0014 <-   1.930    516  Ack Psh Win=65535 Seq=2241385350 Ack=1412583418    
  F1=Help      F2=Split     F3=Exit                   F5=Find      F6=Refresh   
  F7=Backward  F8=Forward   F9=Swap     F10=Left     F11=Right

Enter S next to a packet.
The data for that packet appears.
Press F3 (Exit) twice.
You return to the Connections (Advanced) panel.
Enter PTD (Inactivate and Delete Packet Trace) next to the connection being traced, and press Enter to confirm your action.
The trace is stopped and deleted.
Press F3 (Exit) three times.
You return to the Network Diagnosis : Primary Menu.