create barcode image in vb.net 3: Network Connectivity in C#.NET

Generating PDF 417 in C#.NET 3: Network Connectivity

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3: Network Connectivity
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Part 3: Network Connectivity
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If you re using a residential gateway device and you find yourself unable to use PathPing across it, you might need to upgrade your device to the latest firmware revision. For more information, visit your device manufacturer s Web site.
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Using Ipconfig
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Ipconfig is a popular command-line tool that gives you complete TCP/IP information for the adapters configured on your computer. Use Ipconfig to identify a NIC s Media Access Control (MAC) address, IP address, subnet mask, default gateway, DNS server, Dynamic Host Configuration Protocol (DHCP) server, and so on. Ipconfig is a great tool for troubleshooting because you can quickly gain all of the TCP/IP configuration data about a computer.
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note The information that you ll find when using Ipconfig is the same information that is
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displayed in the Winipcfg graphical tool, which was included in Microsoft Windows 95, Microsoft Windows 98, and Microsoft Windows Me. Winipcfg is not included in Windows XP, but you can acquire the same information using Ipconfig or by opening Network Connections, right-clicking a network connection, and choosing Status to open the connection s status dialog box.
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The most commonly used option in Ipconfig is the /all option. At the command prompt, type ipconfig /all. You ll see a listing of the computer s current IP address configuration, as shown in Figure 12-6.
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Figure 12-6.
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Typing ipconfig /all gives you complete IP addressing information.
There are additional switches that you can use with Ipconfig, but you should exercise caution because some of these switches will disrupt your computer s network connectivity. However, these options can help you solve IP addressing problems. The most commonly used options are listed in Table 12-3. To see a complete list of options, type ipconfig / at the command prompt.
3: Network Connectivity
12: Solving Connectivity Problems
Table 12-3. Ipconfig Command Options Option Action
[none] /all /release /renew /flushdns /registerdns Shows basic IP configuration information for all NICs and active IP connections on the computer. Shows the host name and detailed IP configuration information for all NICs and active IP connections on the computer. Releases an IP address lease assigned to the NIC by DHCP. Sends a lease renewal request to a DHCP server for the NIC. Purges all entries in the DNS Resolver cache. Reregisters all DNS names and refreshes DHCP leases.
Using Netstat
Netstat displays all the active connections to your computer. You can also use Netstat to view the bytes sent and received from your computer as well as any dropped network packets. As shown in Figure 12-7, typing the basic form of the command, netstat, displays each connection s protocol, local (MAC) address, foreign (IP) address, and the current state of the connection.
Figure 12-7. Use Netstat to see your computer s current network connections.
There are several helpful options, or switches, you can specify on the command line. Table 12-4 on the next page lists the most common, and you can view all of them by typing netstat / at the command prompt.
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3: Network Connectivity
Part 3: Network Connectivity
Table 12-4. Netstat Command Options Option Action
a e n This switch displays all connections and listening ports. This switch displays Ethernet statistics. You can also use this switch with the s switch. This switch displays addresses and ports in numerical form. This option can make Netstat data more difficult to read, but is useful if you need numerical data. This switch displays the numeric process ID associated with each IP connection. This allows you to determine which program is maintaining the IP connections established by (or to) your computer. For more information on this option, see Using Netstat to Observe IP Connections, page 584. This option allows you to specify which protocol statistics you want to see. For example, netstat p udp only displays UDP connections. This switch displays connection statistics classified by protocol.
p protocol
Using Nbtstat
Nbtstat (NetBIOS over TCP/IP) is a tool for troubleshooting NetBIOS names over TCP/IP. This tool is helpful when TCP/IP is having problems resolving NetBIOS names to IP addresses. Type nbtstat at the command prompt to see a list of command-line options for this command. For example, typing nbtstat c will list the NetBIOS names of computers on your network from the NetBIOS over TCP/IP (NBt) protocol cache maintained by Windows XP along with their IP addresses. You can learn more about Nbtstat by visiting the Help And Support Center (choose Start, Help And Support).
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