If it detects a DHCP server on the network, APIPA stops, and the DHCP server replaces the APIPA networking addresses with dynamically assigned addresses. The APIPA service also checks regularly for the presence of a DHCP server (every five minutes, according to Microsoft). A client uses the self-configured IP address until a DHCP server becomes available. The client also configures itself with a default class B subnet mask of 255.255.0.0. If the client is unable to find the information, it uses APIPA to automatically configure itself with an IP address. Automatic Configurations and Service Checks If you are seeing such error message on your screen of the PC, that means something is wrong with the router DHCP. When a DHCP client boots up, it first looks for a DHCP server in order to obtain an IP address and subnet mask. Why DHCP failed APIPA is being used APIPA stands for Automatic Private IP Addressing, and is a feature on the windows or some other operating systems to self-configure the IP address and Subnet mask if DHCP server isn’t reachable. With APIPA, DHCP clients can automatically self-configure an IP address and subnet mask when a DHCP server isn’t available. APIPA is short for Automatic Private IP Addressing, a feature of Windows operating systems, meant for non-routed small business environments, usually less than 25 clients. Go back to the “Cable” in the left pane menu under “CONNECTIONS” and it should now be available in the second drop down menu. To fix this, go to “FastEthernet6” in the left pane menu under “INTERFACE” (same options window ie Internet /Config). However, in the second dropdown there are NO OPTIONS in the dropdown menu. In the first drop down box choose Coaxial and in the second drop down box choose Ethernet then click the Add button to add these as the From Port and To Port as shown in the figure…’ Instructions provide ‘…In the left pane click on Cable under CONNECTIONS. Step 4B ( 2.1.1.5 ) Configure the Internet Cloud (if following the instructions, do step 4d before 4b ) : Other problems I had in this module (which may help someone I hope): DHCP failed : APIPA is being used my config interface FastEthernet0/1 description pc switchport access vlan 10 switchport mode access no. Use WRT300N, and everything uses DHCP not APIPA to resolve all the IP addresses. In “wireless devices” there are TWO wireless routers : “Home Router” and “WRT300N”. I had a similar problem, assuming I am using the same version of PT as you.
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