Some Study Guides for 220-702 – IT Pro Community to disable APIPA
The client is configured as a DHCP client, but no DHCP server is available to service the DHCP request.
The client originally obtained a DHCP lease from a DHCP server, but when the client ccna exam tried to renew the DHCP lease, the DHCP server was unavailable.In the next sections you will learn how APIPA works, how to determine if your computer is using APIPA, and how to disable APIPA.
By default, a range of Class B network addresses, 169.254.0.1–169.254.255.254, has been set aside as private Class B network addresses. Windows Vista uses this range of addresses to automatically assign IP addresses if APIPA is used.The client will select an address from the range of private Class B addresses that have been allocated, using the subnet mask of 255.255.0.0.
The client will use duplicate-address detection to verify that the address that was selected is not already in use. If the address is already in use, the client will repeat steps 1 and 2, for a total of up to 10 retries. If the address is not already in use, the client will configure its interface with the address that was selected.
As a background process, the client will continue to search for a DHCP server every five minutes. If a DHCP server replies to the request, the APIPA configuration will be dropped and the client will receive new IP configuration settings from the DHCP server.
To determine if your computer is configured using APIPA, you would use the following command:The ipconfig /all command will produce verbose text. If you see “Autoconfiguration Enabled” within the text and the IP address for your computer is within the 169.254.0.1– 169.254.255.254 range, then your computer is using APIPA.
If you want to disable APIPA for a network adapter, you have to configure a statically assigned Alternate Configuration. We will cover how to do that later in this chapter.
You can manually configure IP addressing if you know your IP address and subnet mask. If you are using optional components such as a default gateway or a DNS server, you will need to know the IP addresses of the computers that host these services as well. This 70-680 option is not typically used in large networks because it is time-consuming and prone to user error.
In Exercise 8.3, you will manually configure IP addressing. This exercise assumes that you have a network adapter installed in your computer.
If you are on a “live” network, check with your network administrator before you make any changes to your IP configuration.In the Network and Sharing Center dialog box, click the Manage Network Connections option. You will see your Local Area Connection as an icon.
Right-click Local Area Connection and select Properties.In the Local Area Connection Properties dialog box, highlight Internet Protocol Version 4 (TCP/IP) and click the Properties button.
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