Troubleshooting the network setup - IBM Websphere

There are several tools available to help you troubleshoot the network setup.

Ping and TCP Connect

Prior to any other debug steps, it is important to verify network connectivity. You can verify networkconnectivity by checking the connectivity between the internal and external destination with the Ping and TCP Connect tools. Ensure that both source and target locations are running. Then, verify that the target IP destination address is reachable from the DataPower appliance. Also,ensure that the target ports are reachable using TCP Connect.

You can test connectivity to the remote host by using these two methods. Enter the IP address or host name. When the appliance cannot connect to the back-end application server, use this tool.Use the TCP Connection Test. As an example, an FTP server uses port number 21, so we click TCP Connection Test to check if the FTP server is up and running. Note that the Ping Remote command is successful, although the FTP server is down. We see that the FTP server cannot be reached.

Ping Remote and TCP Connection Test

Ping Remote and TCP Connection Test

When you receive the error, start the FTP server and repeat the test.The result is then successful.

Packet Capture

In certain instances, it is necessary to capture the full network-level exchange between an appliance and another resource in the network in order to understand what is happening. A packet trace contains a capture of network traffic in pcap format and is stored in the temporary directory. The tool is useful when troubleshooting network connectivity, TCP sequencing, or other network-level problems.

To capture network packets:

  1. Switch to the default domain.
  2. On the Control Panel, click the Troubleshooting icon.
  3. Look for the Networking section.

You can initiate a packet capture session on an Ethernet or virtual LAN (VLAN) interface. The options are set in the Packet Capture section.The appliance initiates a default packet capture session on the target interface.The appliance closes the session after 30 seconds or after the capture of 10 MBs of data, whichever occurs first. Alternatively, click Stop Packet Capture to end a packet capture session. By default,captured data is stored in the capture.pcap file in the temporary: directory(temporary:///capture.pcap).

Packet Capture tool

Packet Capture tool

The data in a packet capture is saved in the pcap format. Use a utility,such as tcpdump or ethereal,tointerpret the file.a pcap capture that is viewed in ethereal.

Packet Capture example

Packet Capture example

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