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The first two steps of the following sequence are already performed by the Ipconfig /all command and Netdiag. (Network Diagnostics automatically performs only the second step. If Network Diagnostics reports that this self-ping test has failed, you can perform the first step manually.)

1. Ping the loopback address to verify that TCP/IP is installed and configured cor rectly on the local computer. To perform this step, enter ping 127.0.0.1 at a com mand prompt. If the loopback step fails, the IP stack is not responding. This problem might be occurring because the TCP drivers are corrupted, the network adapter might not be working, or another service might be interfering with IP. 2. Ping the IP address of the local computer to verify that an address has been added correctly. To perform this step, enter ping <IP address of local host> at a com mand prompt. 3. Ping the IP address of the default gateway. This step verifies that the default gateway is reachable and that the local host can communicate with another host on the network. To perform this step, enter ping <IP address of default gateway> at a command prompt. 4. Ping the IP address of a remote host located beyond the default gateway. This step verifies that you can communicate with hosts outside your local network segment. To perform this step, enter ping <IP address of remote host> at a command prompt. 5. Ping the IP address of a remote host located beyond the default gateway. This step verifies that you can communicate with hosts outside your local network segment. To perform this step, enter ping <IP address of remote host> at a command prompt. 6. Ping the IP address of a remote host located beyond the default gateway. This step verifies that you can communicate with hosts outside your local network segment. To perform this step, enter ping <IP address of remote host> at a command prompt.

Compare characters to the null terminator (<;$QS>\0<;$QS>) explicitly Characters, like numbers, aren t logical expressions. Thus, for characters, write

3-25

Configure the following input packet filters on the perimeter network interface of the firewall to allow the following types of traffic:

To perform this last step more quickly, you can substitute the Tracert utility for the PathPing utility. Tracert reveals breaks in connectivity but does not provide statistics about router performance. Tracert is described in more detail in the following section.

while ( *charPtr != '\0' ) ...

Ping uses host name resolution to resolve a computer name to an IP address, so if pinging succeeds by address, but fails by name, the problem lies in host name resolu tion, not network connectivity. If you cannot ping successfully at any point, check to make sure the following are true:

The local computer s IP address and subnet mask are correctly configured. A default gateway is configured and the link between the host and the default gateway is operational. For troubleshooting purposes, make sure only one default gateway is configured.

There are no hard-and-fast rules for when you should establish a naming convention, but here are a few cases in which conventions are worthwhile: When multiple programmers are working on a project When you plan to turn a program over to another programmer for modifications and maintenance (which is nearly always) When your programs are reviewed by other programmers in your organization When your program is so large that you can t hold the whole thing in your brain at once and must think about it in pieces When the program will be long-lived enough that you might put it aside for a few weeks or months before working on it again When you have a lot of unusual terms that are common on a project and want to have standard terms or abbreviations to use in coding

Protocol ID of 50 (0x32). This filter allows IPSec ESP traffic from the VPN server. Configure the following output packet filters on the perimeter network interface of the firewall to allow the following types of traffic:

If the remote system being pinged is across a high-delay link such as a satellite link, responses might take longer to be returned. You can use the w switch to specify a longer time-out. For example, the command ping w 2000 172.16.48.10 waits 2 seconds before tim ing out. (The default setting is 1 second, expressed as 1000 milliseconds.)