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Internet Control Message Protocol provides troubleshooting facilities and error reporting for packets that are undeliverable. For example, if IP is unable to deliver a packet to the destination host, ICMP sends a Destination Unreachable message to the source host. Table 19-1 shows the most common ICMP messages.

Tracking user logons is crucial for being able to detect undesired logon attempts to your Windows XP computer as well as for diagnosing problems with desired account accesses.

Description Troubleshooting message used to check IP connectivity to a desired host. The Ping utility sends ICMP Echo Request messages. Response to an ICMP Echo Request. Sent by a router to inform a sending host of a better route to a destination IP address. Sent by a router to inform a sending host that its IP datagrams are being dropped because of congestion at the router. The sending host then lowers its transmission rate. Sent by a router or the destination host to inform the sending host that the datagram cannot be delivered.

When the result of an ICMP request is a Destination Unreachable message, a specific message is returned to the requestor detailing why the Destination Unreachable ICMP message was sent. Table 19-2 describes the most common of these messages.

Table 19-2

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Description Sent by an IP router when a route to the destination IP address cannot be found Sent by the destination IP node when the Protocol field in the IP header cannot be matched with an IP client protocol currently loaded Sent by the destination IP node when the destination port in the UDP header cannot be matched with a process using that port Sent by an IP router when fragmentation must occur but is not allowed because of the source node setting the Don t Fragment (DF) flag in the IP header

Unreachable Message Host Unreachable Protocol Unreachable Port Unreachable Fragmentation Needed and DF Set

ICMP does not make IP a reliable protocol. ICMP attempts to report errors and provide feedback on specific conditions. ICMP messages are carried as unacknowledged IP datagrams and are themselves unreliable. ICMP is defined in RFC 792.

Auditing must first be enabled at the system level before it becomes effective. To enable system auditing, launch Local Security Settings by opening Local Security Policy from the Administrative Tools folder. Double-click Local Policies, and then select Audit Policy. From here, you can audit either successful or failed (or both) account logon events, account management events (such as password changes), directory service access, logon events, object access, policy changes, privilege uses, process tracking, and system events. For basic security purposes, enable auditing for Audit Account Logon Events and Audit Logon Events. Right-click the first of these audit policies, choose Properties, and select both the Success and Failure options. Then repeat the steps for the other policy. Once auditing is enabled, you can review the logon successes and failures in the Security Event Log by opening Event Viewer in the Administrative Tools folder and clicking Security in the left pane, as shown in Figure 20-7.

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1. In the Document Outline window, select the WebBrowser control called myBrowser, and drag it just below the tool strip container content panel called mainFormToolStripContainer.ContentPanel. (When you drag the WebBrowser control, a black line indicates where the control will be dropped if you release the mouse button.) 2. Now display the form again. The WebBrowser control is in the middle of the form. But as you can see, the MenuStrip control is not in the tool strip container. Repeat step 1 for the MenuStrip control, but instead of dropping it in the content panel, drop it in the top panel of the tool strip container (mainFormToolStripContainer.TopToolStripPanel). Now the only thing missing from the new menu strip is a dotted grip like the one shown earlier in Figure 6-11. Without this grip, a user is unable to select the menu strip at all; it is fixed in the top panel.

The transport layer is responsible for providing session and datagram communication services over the IP protocol. The two core protocols of the transport layer are the Transmission Control Protocol (TCP) and User Datagram Protocol (UDP):

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