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NETSH SYNTAX For backward compatibility, you can use netsh interface ip in place of netsh interface ipv4 For IPv6 Netsh commands, you must specify IPv6. Note also for static settings, the interface name is simply local area connection The syntax name="local area connection" is acceptable but not necessary. For dynamic configuration you need to use name="local area connection".
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Troubleshooting Network Connectivity As an IT professional, one of the most common problems you encounter is computers not being able to connect to one another, to other internal networks within your organization, or to the Internet. In this section, you look at general troubleshooting tools that help you debug network connectivity, as well as the Windows Network Diagnostics tool. Basic Troubleshooting Connection problems can have many possible causes. In wired networks, a cable could be faulty or might not be connecting properly to its socket. Interfaces that should get their IP configurations dynamically could be set with a static configuration. Where two or more interfaces form a network bridge, one or more interfaces could have been removed from the bridge. In the enterprise environment, a DHCP or DNS server, or even a domain controller, might have developed a fault (although there is typically a failover mechanism in this situation). A firewall might be misConfigured. On a small network, ICS might be set up incorrectly or not set up at all. A third-party WAP could have been added to a wired network so that wireless computers can connect, but the computer previously Configured to provide ICS might not be reConfigured to obtain its configuration from the WAP. A WAP, network adapter, or modem could be faulty. Your ISP could be suffering an outage. Newly installed software might have changed your connection properties. The list is practically endless. First principles always apply. Start with the network and ensure that no cables have been pulled out or are halfway out and causing unreliable connections. Make sure all the appropriate light-emitting diodes (LEDs) on the modem, WAP, and network interfaces are lit when they should be lit and flickering when they should be flickering. If a device shows no sign of life, check that its power supply is connected to a power socket and to the device. Check out any illuminated red LEDs. A red light does not always indicate a fault, but red frequently signifies danger. If you are having problems with wireless connections, try switching the WAP off. You should then power down any computers that connect to the WAP through Ethernet cables and possibly your wireless computers as well. Wait a few minutes, switch the WAP back on, and restart the computers. If you suspect the modem, switch off the modem, the WAP, and all network computers and then turn them on again in that order. Check the WAP settings. Checking Computer to Computer Connectivity Before you start to use the tools Windows 7 provides to check computer-to-computer connectivity, make sure the computer you are trying to connect to is switched on. In a wired
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network, make sure it is plugged into the network. If you are using ICS, make sure the ICS computer is switched on and running, otherwise none of the other computers will connect to the Internet. If the computers on your network get their IPv4 configurations from a third-party WAP, make sure the WAP is switched on and connected to the modem. For a computer running Windows 7 to connect to other computers on a LAN, Network Discovery needs to be enabled on both the source and destination computers. Network Discovery is enabled by default, but if you are having problems accessing other computers, check this setting by clicking Change Advanced Sharing Settings in the Network And Sharing Center. Figure 6-5 shows the Advanced Sharing Settings dialog box.
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Figure 6-5: The Advanced Sharing Settings dialog box If a network connection is suffering intermittent problems, it is sometimes sufficient to disable and then enable the network connector device driver. If this does not help, the device driver might be corrupt or out of date, or it might recently have been replaced by a new driver that is causing compatibility problems. 4, "Managing Devices and Disks," gives more details about updating, uninstalling, rolling back, and troubleshooting drivers. Troubleshooting IP Configuration Command-line tools for troubleshooting IP configuration have been around for some time and are well known. The Ping tool is still widely used, although more firewalls block Internet Control Message Protocol (ICMP) echo requests than used to be the case. However, even if you cannot get past a firewall on your organization's network, Ping is still useful. You can check that the IPv4 protocol is working on a computer by entering ping 127.0.0.1. You can then ping the IPv4 address of the computer. You can find out what this is by using the Ipconfig tool. If your computer has more than one interface combined in a network bridge, you can ping the IPv4 address of the network bridge. When you have established that you can ping your computer using an IPv4 address, you can test that DNS is working internally on your network (assuming you are connected to a DNS server, a WAP, or have ICS Configured on your network) by pinging your computer name for example, entering ping canberra. Note that if DNS is not implemented on your system, ping canberra still works because the IPv6 link-local address resolves automatically.
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