Lesson 5 in VB.NET

Printer Data Matrix 2d barcode in VB.NET Lesson 5

Lesson 5
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Troubleshooting TCP/IP Addressing
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Figure 2-7
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The Network Connections control panel s Advanced Settings dialog box
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Troubleshooting Client Configuration Problems
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The most obvious source of problems on a TCP/IP network is the existence of dupli cate IP addresses. When two computers have the same IP address, packets end up in the wrong place and message transactions are interrupted. Fortunately, the Windows operating systems check for the existence of a duplicate address each time the com puter starts. If Windows detects a duplicate IP address, it disables the TCP/IP protocol stack on the newly started computer and displays an error message specifying the hardware address of the system with which the computer is in conflict. The computer that is the original owner of the duplicate address continues to function normally. When you reconfigure the other computer with a different, nonconflicting IP address, the TCP/IP stack becomes active again on that computer.
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Incorrect Subnet Masks
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As you learned earlier in this chapter, the function of the subnet mask is to let the com puter know which bits of the computer s IP address identify the host and which bits identify the network on which the host is located. If two computers have different subnet masks, their network addresses are different, and the computers see them as being on different subnets even if they have correct IP addresses. Computers that are on dif ferent subnets cannot communicate with each other except through a router, so if you have a computer that can t communicate with the other systems on the network, the problem might be that the computer s subnet mask is incorrect.
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2
Planning a TCP/IP Network Infrastructure
To view the subnet mask and all the other TCP/IP configuration settings at once on a computer running Windows 2000, Windows XP, or Windows Server 2003, you can use the Ipconfig.exe program. Display a Command Prompt window, type IPCONFIG /all on the command line, and press Enter to generate a display like the following:
Windows IP Configuration Host Name . . . . . . . . . . . Primary DNS Suffix . . . . . . Node Type . . . . . . . . . . . IP Routing Enabled. . . . . . . WINS Proxy Enabled. . . . . . . DNS Suffix Search List. . . . . Ethernet adapter Local Area Connection: Connection-specific DNS Suffix Description . . . . . . . . . . Physical Address. . . . . . . . DHCP Enabled. . . . . . . . . . IP Address. . . . . . . . . . . Subnet Mask . . . . . . . . . . Default Gateway . . . . . . . . DNS Servers . . . . . . . . . . .: .: .: .: .: .: .: .: .: .: .: .: .: .: CZ7 adatum.com Hybrid No No adatum.com
Intel(R) PRO/100 VE Network Connection 00-D0-59-83-B1-52 No 192.168.2.7 255.255.255.0 192.168.2.99 192.168.2.10 192.168.86.15 Primary WINS Server . . . . . . .: 192.168.2.10
Incorrect Default Gateway Addresses
If a TCP/IP computer is able to communicate with other systems on the same LAN but is unable to communicate with systems on other LANs, there is likely a problem with the computer s default gateway. The default gateway is the router that a computer uses whenever it has to communicate with a computer on another network. The routing table of a TCP/IP computer contains specific network addresses and information on how to reach them. If the computer must send traffic to a system on one of the networks listed in the table, the computer uses that table entry to route the packets prop erly. If the computer has traffic to send to a system on a network that is not listed in the table, the computer sends the traffic to the default gateway. If a TCP/IP computer does not have a default gateway address in its configuration, it can communicate with the other systems on the LAN (because no router is needed), but it can t communicate with other networks. In the same way, if the default gateway address is incorrect and doesn t point to a router, or points to a router that is not func tioning properly, no internetwork communication can occur. If you find that one of your computers is impaired in this way, you should check the Default Gateway setting in the Internet Protocol (TCP/IP) Properties dialog box if your computer uses a static IP address (see Figure 2-8) or by using the IPCONFIG /all command if the computer has obtained its address from a DHCP server. If the default gateway address is correct, you should check the functionality of the default gateway itself to make sure that it is running and routing traffic.
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