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CHapTER 31 Troubleshooting Network Issues
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If the network adapter still has an APIPA address, the DHCP server is offline . Bring a DHCP server online and restart the computer . If the network does not use a DHCP server, configure a static or alternate IPv4 address provided by your network administration team or your ISP . For information about configuring static IP addresses, see 25 . For more information about IPConfig, read the section titled IPConfig earlier in this chapter .
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If all network adapters show DHCP Enabled: No in the display of the ipconfig /all command, the network adapter might be misconfigured . If DHCP is disabled, the computer has a static IPv4 address, which is an unusual configuration for client computers . Update the network adapter IPv4 configuration to Obtain An IP Address Automatically and Obtain DNS Server Address Automatically, as shown in Figure 31-6 . Then configure the Alternate Configuration tab of the IP Properties dialog box with your current, static IP configuration . For information about configuring IP addresses, see 25 .
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FIgURE 31-6 Enable DCHP for most client computers .
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For most networks, set client configuration to Obtain An IP Address Automatically .
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Having arrived at this step, you know that your computer has a valid, DHCP-assigned IPv4 address and can communicate on the LAN . Therefore, any connectivity problems are caused by failed or misconfigured network hardware . Although you cannot solve the problem from a client running Windows, you can still diagnose the problem . View the output from the ipconfig command and identify the IPv4 address of your default gateway . Verify that the IPv4 address of the default gateway is on the same subnet as the network adapter s IP address . If they are not on the same subnet, the default
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The Process of Troubleshooting Network Problems
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CHapTER 31
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gateway address is incorrect the default gateway must be on the same subnet as the client computer s IPv4 address .
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note
To determine whether an Ipv4 address is on the same subnet as your computer s
Ipv4 address, first look at your subnet mask. If your subnet mask is 255.255.255.0, compare the first three sets of numbers (called octets) in the Ipv4 addresses (for example, 192.168.1 or 10.25.2). If they match exactly, the two Ipv4 addresses are on the same subnet. If your subnet mask is 255.255.0.0, compare the first two octets. If your subnet mask is 255.0.0.0, compare only the first octet (the first grouping of numbers before the period in the Ip address). If any of the numbers in the subnet mask are between 0 and 255, you will need to use binary math and the aND operation to determine whether they are on the same subnet.
Attempt to ping the default gateway using the following command .
ping default_gateway_ip_address
For example, given the following IPConfig output:
Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : hsd1.nh.contoso.com.
Link-local IPv6 Address . . . . . : fe80::1ccc:d0f4:3959:7d74%10 IPv4 Address. . . . . . . . . . . : 192.168.1.132 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.1.1
you would run the following command .
ping 192.168.1.1
If the Ping results show Request timed out, your computer has the incorrect IP address configured for your default gateway, your default gateway is offline, or your default gateway is blocking ICMP requests . If the Ping results show Reply from , your default gateway is correctly configured, and the problem is occurring elsewhere on the network .
note
ping is not a reliable tool for determining whether computers or network
equipment are available on the network. Today, to reduce security risks, many administrators configure devices not to respond to ping requests. However, ping is still the most reliable tool for testing routers, and most administrators configure routers to respond to ping requests from the local network. It s a good idea to ping your network equipment when everything is working properly just to determine whether it responds under normal conditions.
CHapTER 31 Troubleshooting Network Issues
Use the Tracert command to test whether you can communicate with devices outside your LAN . You can reference any server on a remote network; however, this example uses the host www.microsoft.com .
C:\>tracert www.microsoft.com Tracing route to www.microsoft.com [10.46.19.30] over a maximum of 30 hops: 0 1 2 3 4 5 win7.hsd1.nh.contoso.com. [192.168.1.132] 192.168.1.1 c-3-0-ubr01.winchendon.ma.boston.contoso.com [10.165.8.1] ge-3-37-ur01.winchendon.ma.boston.contoso.com [10.87.148.129] ge-1-1-ur01.gardner.ma.boston.contoso.com [10.87.144.225] 10g-9-1-ur01.sterling.ma.boston.contoso.com [10.87.144.217]
The 0 line is your client computer . The 1 line is the default gateway . Lines 2 and above are routers outside your local area network .
If you see the message Unable to resolve target system name, your DNS server is unreachable because the DNS server is offline, your client computer is misconfigured, or the network has failed . If your DNS server is on your LAN (as displayed by the ipconfig /all command) and you can still ping your router, the DNS server has failed or is misconfigured; see the section titled How to Troubleshoot Name Resolution Problems later in this chapter for more information on these issues . If your DNS server is on a different network, the problem could be either a network infrastructure problem or a name resolution problem . Repeat this step, but use Ping to contact your DNS server IP address (as displayed by the ipconfig /all command) . Then, follow the steps outlined in the section titled How to Troubleshoot Name Resolution Problems later in this chapter to further isolate the issue . If nothing responds after line 1, your default gateway cannot communicate with external networks . Try restarting the default gateway . If the default gateway is connected directly to the Internet, the Internet connection or the device that connects you to the Internet (such as a cable or DSL modem) might have failed . Contact your ISP for additional troubleshooting . If the same gateway appears multiple times in the Tracert route, the network is experiencing a routing loop . Routing loops can cause performance problems or cause communications to fail entirely . Networks typically fix routing loops automatically; however, you should contact your network support team to make sure they are aware of the problem . The following Tracert output demonstrates a routing loop, because nodes 5, 6, and 7 repeat .
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