TraceRoute Class

Properties Methods Events Configuration Settings Errors

The TraceRoute component allows you to trace the path IP packets take on the Internet.

Syntax

TraceRoute

Remarks

The component implements a standard IP Traceroute as defined in RFC 1393.

To use the class, simply call the TraceTo method and set the Host parameter to the domain name or IP address of the host you want to trace the path to. This is identical to setting the RemoteHost property to the domain name or IP address. The class will start sending probe packets towards the host, and as it receives replies it will fire Hop events giving information about the route. The same information is also provided in the Hops properties.

The ResolveNames property enables or disables DNS resolution of IP addresses received during the trace. If set to False only IP addresses are provided. If set to True the class will attempt to resolve the names of the hosts in the route. This may considerably increase the time it takes to complete the trace.

The HopTimeout property determines the maximum waiting time for a response in each hop of the trace, while the Timeout property defines the maximum waiting time for the whole trace. The HopLimit property specifies the maximum number of hops allowed for a trace.

Property List

The following is the full list of the properties of the class with short descriptions. Click on the links for further details.


HopLimit	The maximum number of hops to allow for a trace.
HopCount	The number of records in the Hop arrays.
HopErrorCode	The error code for particular hop in the trace.
HopErrorDescription	The error description for particular hop in the trace.
HopHostAddress	The IP address of the host for a particular hop in the trace.
HopHostName	The name of the host for a particular hop in the trace.
HopTime	The amount of time taken by a particular hop in the trace.
HopTimeout	Maximum amount of time to wait for an individual hop to complete.
Idle	The current status of the component.
LocalHost	The name of the local host or user-assigned IP interface through which connections are initiated or accepted.
RemoteHost	The address of a host to trace to.
ResolveNames	Determines whether the component resolves the host name for each host during the trace.
Timeout	A timeout for the component.

Method List

The following is the full list of the methods of the class with short descriptions. Click on the links for further details.


Config	Sets or retrieves a configuration setting .
DoEvents	Processes events from the internal message queue.
Interrupt	Interrupt the current method.
TraceTo	Trace the route to a host.

Event List

The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.


Error	Information about errors during data delivery.
Hop	Fired for each hop in the trace to the RemoteHost .
HopResolved	Fired when the name of a hop address is found.

Configuration Settings

The following is a list of configuration settings for the class with short descriptions. Click on the links for further details.


HopTimeoutInMilliseconds	The hop timeout is treated as milliseconds.
TimeoutInMilliseconds	The timeout is treated as milliseconds.
IcmpDllTimeout	The timeout for the component when using the icmp.dll.
MaxMessageSize	The maximum length of the messages that can be received.
MulticastTTL	The time to live (TTL) value for multicast ICMP packets sent by the component.
UseConnection	Determines whether to use a connected socket.
TimeoutInMilliseconds	The timeout is treated as milliseconds.
UseICMPDLL	Use the icmp.dll included on Windows Systems.
UseIPHLPDLL	Use the iphlpapi.dll included on Windows Systems.
AbsoluteTimeout	Determines whether timeouts are inactivity timeouts or absolute timeouts.
FirewallData	Used to send extra data to the firewall.
InBufferSize	The size in bytes of the incoming queue of the socket.
OutBufferSize	The size in bytes of the outgoing queue of the socket.
CodePage	The system code page used for Unicode to Multibyte translations.