TraceRoute and Ping Component
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You can use this component to create client programs (with Visual Basic, for example) or server-based
applications (with Active Server Pages). To ping a remote host, call the Ping method specifying the target host name or IP address. If the ping is successful (no errors raised), then read the ping time from the RoundTripTime property. The address of the target host can be read from the ReplyAddress property. To improve performance, addresses are not automatically resolved to host names. To resolve the address to a host name, read the ReplyHostName property. To trace the route to a remote host, first set the TTL (time to live) property to 1. Then call the Ping method as above. Because the ping packet has a time to live set to 1 hop, the first router along the path to the target host will reply to the ping. The roundtrip time, address and host name of the router can be read from the RoundTripTime, ReplyAddress and ReplyHostName properties as described above. To continue tracing, put the above step in a loop, repeatedly incrementing the value of the TTL property. An 'IP TTL expired in transit' error following a ping indicates that we have pinged a router (or 'hop') along the route to the target host. If no error is raised, this indicates that we have have reached the end of the route pinged the target host itself. Furthermore, in this case, the TTL value we specified represents the number of hops to the target host itself. Installing the Component Download and install the setup kit containing the evaluation component. Note that the component requires the standard Visual Basic 6.0 runtime libraries. If these are not already installed on your system, click here to download them from Microsoft's web site. Sample Programs You can now run the sample Visual Basic or Active Server Page code samples included with the evaluation component. Visual Basic When creating a Visual Basic program, you must first set a reference to the component. Create a new project and then on the Project menu click References to open the References dialog box. Locate the component (named 'Volto TraceRoute and Ping Component') in the list, and check it. Distributing the Component When you purchase a license for this component, you will be provided with a serial number, a license key and a redistributable runtime license file. As a licensed user you may distribute the component with your compiled applications royalty-free. To ensure that your application will function correctly on a target system, your program must call the ProductLicense method to unlock licensed functionality. See the Technical Reference for more information on using this method. Your application setup package must copy the component and the runtime license file to the same directory and the component must be registered. Also ensure that the Visual Basic 6.0 runtime files are installed on the target system. These files (and minimum version numbers) are:
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