lesson 6: dynamic host configuration protocol dhcp (part2)

7/29/2019 Lesson 6: Dynamic Host Configuration Protocol DHCP (Part2)

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Mahmmoud A. Mahdi


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9. On the specify IPv4 WINS Server Setting page. Then, leave the selection specifying that WINS is not required for

applications on the network and click Next.

10. On the Add Or Edit DHCP Scopes page, read all of the text

on the page, and then click Add. The Add Scope dialog box appears.

11. Use the following information to complete the fields in theAdd Scope dialog box:

Scope Name: Nwtraders.msft IPv4

Starting IP Address: 192.168.0.20

Ending IP Address: 192.168.0.254 Subnet Mask: 255.255.255.0

Default Gateway(optional): 192.168.0.1

Subnet Type: Wired (lease duration will be six days)

Activate this scope: Enabled


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12. After you have entered the appropriate values inthe Add Scope dialog box, click OK

13. On the Add Or Edit DHCP Scopes page, click Next.

14. On the Configure DHCPv6 Stateless Mode page,read all of the text on the page.

Then, leave the Enable DHCPv6 Stateless Mode For ThisServer option selected and click Next.

15. On the Specify IPv6 DNS Server Setting page, readall of the text on the page.

Then verify Then, verify that nwtraders.msft is specifiedas the parent domain and that fd00::1 is specified as thepreferred DNS Server IPv6 address. Click Next.


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4. After the command prompt completes successfully

and the prompt reappears, type the following:

netsh interface ipv4 set dnsserver local area

connection dhcp

5. After the command prompt completes successfully

and the prompt reappears, type ipconfig/all.

The Ipconfig output shows that DHCP is enabled and

that Boston has received a new IP address 192.168.0.20.

6. Log off both computers.


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After you add the DHCP Server role, you can

perform further configuration tasks by

using the DHCP console. These tasks include:

1. Configuring exclusions.

2. Creating address reservations.

3. Adjusting the lease duration of a scope

4. Configuring additional scope or server options.


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An exclusion range is a set of one or more IPaddresses that is included within the rang of adefined scope but that you do not want to lease

to DHCP clients. For example:

define a new scope whose address range is192.168.0.10-192.168.0.254. You might have a number of preexisting servers whose

static addresses might lie within this range-for examplebetween 192.168.0.200 and 129.168.0.210.

You might have servers with isolated static addresses, suchas 192.168.0.99


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To add an exclusion range:

1. In the DHCP console tree navigate to DHCP \

\ IPv4 \Scope\Address Pool.2. Right-click the Address Pool folder.

3. Choose New Exclusion Range.


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4. In the Add Exclusion dialog box that opens,

configure the range of addresses that you want

to exclude from the address rang.

If you want to exclude a single address, specify the

Start IP Address and the End IP Address as the

same address


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Adding an exclusion range


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To create a reservation in the DHCP console

tree

1. Navigate to DHCP \server node \ IPv4 \ Scope\Reservation.

2. Right-click the Reservation folder.

3. And then choose New Reservation.

4. In the New Reservation dialog box that opens,

specify a name, IP address, and MAC address for

the reservation.


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You can modify the lease duration to be

used for assigning IP address leases.

To adjust the length of lease duration:1. Open the properties of the scope whose lease

duration you want to adjust.

2. You can adjust the lease duration in the General

tab in the Lease Duration For DHCP Clients

area.


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To see the built-in options that you can

configure:

1. In the DHCP console navigate to DHCP\Servernode\IPv4\Scope\Scope options.

2. Right-click the Scope Options folder.

3. And then choose Configure Options.

4. Then use the Scope Options dialog box to

choose an option for the scope.


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An option class is a client category that enablesthe DHCP server to assign options only toparticular clients within a scope.

Options classes can be of two types:1. Vendor classes: are used to assign vendor-specificoptions to DHCP clients identified as a vendor type.

For example: you can configure clients that can beidentified as running Windows 2000 to enable or disable

NetBIOS.2. User classes: are used to assign options to any set

of clients identified as sharing a common need forsimilar DHCP options configuring.


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What is the default user class?

It is a class to which all DHCP clients belong and

the class in which all options are created bydefault.


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User classes enable you to apply a particularconfiguration of DHCP options to any subset of DHCPclients you define.

To implement a user class:

1. Define the class at the DHCP server by assigning an ID and aset of options for the class.

2. Assign selected client computers to that class by using theIpconfig/ setclassidcommand.

A custom user class is helpful when you need to assign

distinct options to distinct sets of client computers. For example, your network might require certain clients to

be assigned a special default gateway that allows them tobypass the company firewall.


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5. After defining a new class and specifying an ID string for thatclass , the new user class appears in the User Class drop-down list box in the Advanced Tap of the Scope Optionsdialog box.

6. You can then select that user class and define a set of optionsthat will be assigned only to members of the class.

7. Finally, you need to populate the class, for the desiredcomputers to inherit the options defined for the new class,you need to set the class ID of appropriate client computersto match the ID you have defined for that class at the DHCP

server. You can do this by executing the Ipconfig/setclassidcommand at a

command prompt at each client computer.

ipconfig/setclassid local area connection sample ID


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8. After you run this command on a DHCP client,

the client will inherit the options defined for

the class in addition to the options defined for

the default user class. If the two optionsconflict , such as with the definition of a

default gateway, the option defined for the

more specific class takes precedence over the

setting defined for the Default User Class.


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To configure a DHCP server on a Server Coreinstallation of windows 2008: Install the DHCP server role by typing the following

command:

start/w ocsetup DHCPServerCore Even though this command installs the DHCP Server service, it

dose not automatically start.

To start the service for the first time, use the followingcommand:

net start dhcpserver To configure the DHCP Service to start automatically,

type the following command:sc config dhcpserver start= auto


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To add scopes and configure the server, you cansimply connect to the server from the DHCPconsole on a computer running a full installation ofWindows Server 2008.

If you want to configure a Server Core installation as aDHCP client for IPv4,type the following commandwhere local area connection is the name of theconnection on the network:

netsh interface ipv4 set address local area connection dhcp

To configure the server to obtain a DNS serveraddress through DHCP, type the followingcommand:netsh interface ipv4 set dnsserver local area connection dhcp


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Exercise 1: Creating an Exclusion Range

In this exercise, you will create an exclusion rangeon Dcsrv1 for the address range 192.168.0.200-

192.168.0.210.1. Log on to Nwtraders from Dcsrv1 as a domain

administrator.

2. Open the DHCP console by clicking Start, pointing

to Administrative Tools, and then choosing DHCP.3. In the DHCP console tree, navigate to

DHCP\dcsrv1. nwtraders.msft \ IPv4 \ Scope[191.168.0.0]Nwtraders.msft\ Address Pool.


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lesson 6: dynamic host configuration protocol dhcp (part2)

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