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In this module we talk about using an alternate configuration, which may be something you want to set for your DHCP clients, in the case they move from subnet to subnet and you don't want them to use APIPA. Now this isn't something we are going to do very often especially on a server 2003 computer. But we might want to implement it on Laptops that may move from place to place frequently and you can use an alternate configuration. First of all we've mentioned it a couple times, let's turn this Server 2003 computer into a DHCP client. Open up the network connections applet through the control panel, find the connection you want to configure, right click choose properties, choose TCP/IP properties and now we're going to obtain an IP address automatically. And then once you select that you can select whether or not to also obtain DNS server address automatically. Notice here that also I am using the loop back address, I'm using the local machine, as the preferred DNS server and the alternate DNS server is the one that is right now functioning as the DNS server, and the DHCP server, it's the router interface that's here in this small lab. So we'll obtain both of these things automatically, click on OK, close and we'll go out and try to find an IP address. In the mean time what I'm going to do is I'm going to pause this and it's telling me right now the connection's unavailable, but I'm going to pause this and now go unplug the network cable to show you APIPA in action. Alright here is what APIPA looks like. Right now notice that the network cable is unplugged, there's no way to find the DHCP server, I open up the command prompt and I do IPconfig renew. I'm going to type in this command and then I'm going to pause it again because it's going to take several seconds for my computer to wait until it decides it cannot find the DHCP server in the network. Now then, now the request has timed out and if you already have an IP address you might want to precede this command with IPconfig release before you actually try to renew. But what you should get at the end if you type IPconfig is an address that looks like this, 169.254.x.y mine happens to be 28.201 If I do /all, you'll see that the auto configuration has been enabled. Auto configuration enabled, yes and that's indeed where I'm getting my IP address, no default gateway. Great, I'm using APIPA, now if there are other computers in this room that were using APIPA as well, I'd be able to communicate with them, but maybe I don't want to use APIPA. In that case I might want to configure through the properties of TCP/IP an alternate configuration. Here is, once you obtain an IP address automatically, you should get an alternate configuration tab. Automatic private IP address or user configured and here I just set a static IP address to use in the event that a DHCP server cannot be found. This is something that is new to the Server 2003, look for it in XP service packs, so it's certainly not something that you configure necessarily on a Server 2003 computer. But you might look for this on your client machines that are clients of maybe a Server 2003 DHCP server. So because it's vital in making a network operate, it's something that's included here and it's something which you should be familiar with.