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Microsoft Windows Server 2003 (70-291) Tutorials

Implementing/Managing/Maintaining IP Addressing Cont'd / Manage DHCP Options

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The other thing that you also typically do as you start to setup your pools of IP addresses that the DHCP server hands out, is you'll manage DHCP options. And there are three kinds of options you can configure. You can configure server options, which specify options that will apply to all DHCP clients of that particular server. You can assign scope options, which assigns values to just clients that get an IP address from a particular scope. Or you can set client options and client options apply to only those computers that have a client reservation. What kinds of options am I talking about here? Let's take a look in our DHCP console. In DHCP if I want to add scope options, choose here. If I want to add server options I click on the server and then I can set predefined options, option class, standard options, option name. So for example maybe every client of this particular DHCP server is going to have the same default gateway. Now the confusing thing is that the default gateway parameter is this one here. It's called router, which is actually what it is, it's a router interface the pathway off the network. So here's what you do, you edit the array, server name IP address, 192.168.3.1 and then add. OK. So there's the value and I've just set an option for all clients of this server. In that example maybe it would have been better to set a scope option and again if I'm handing out IP addresses in the 192.168.3 network, then probably all of the clients of that scope, in fact they all will probably, will have the default gateway of 192.168.3.1. And I use the word probably there because it's kind of common practice that router interfaces get the first IP address for a given network, that's just unwritten administrative practice, unwritten law in the world of configuring networks. What kinds of other options can be set? Well the list is long and it's not important to memorize these but just be familiar with a couple of the more common ones. A very common option is to hand out the IP address of the default gateway. Another very common one is to hand out the IP address of a DNS server. You can type in the server name, resolve it to an IP address and then add it as an option and then click on apply. So now any client who got an IP address from this scope, would also be configured in the acknowledgement packet with the address of the default gateway and the address of a DNS server and that's exactly what a client would receive if they are configured to obtain an IP address automatically and obtain a DNS server address automatically. Again these are two very common options that you typically configure with DHCP. Finally if you have a reservation configured as I've configured one here, then you can also set specific options for just the reservations. So here's a reservation that I've configured, you can right click and configure options and say you want the router to be different, or you want this reservation to use a different name server for resolution 192.168.2.225. add, apply, OK. So there is an option that is just specific to that client reservation. So you can set scope options, client options, server options and there's actually two places where you can set server options but they all use just about the same button clicking. The last thing you do to start handing out IP addresses is to make the scope active. Right click, activate or you can use this button in the console.

Tutorial Information

Course: Microsoft Windows Server 2003 (70-291)
Author: Brian Culp
SKU: 33478
ISBN: 193207273X
Release Date: 2004-02-26
Duration: 8 hrs / 99 lessons
Captions: For Online University members only
Compatibility: Vista/XP/2000, OS X, Linux
QuickTime 7, Flash 8

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