Dhcp Server & Dhcp Relay Agent
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70-291: MCSE Guide to Managing a Microsoft Windows Server 2003 Network
Chapter 4: Dynamic Host Configuration Protocol
Objectives • • • • • • •
Outline the benefits of using DHCP Describe the DHCP lease and renewal process Install and authorize the DHCP service Configure DHCP scopes Create DHCP reservations for client computers Configure DHCP options Understand and describe the purpose of a DHCP relay • Install and configure a DHCP relay 70-291: MCSE Guide to Managing a Microsoft Windows Server Network
2
DHCP Overview • Used to automatically deliver IP addressing • Reduces the amount of time you spend configuring computers on your network • Used by default unless you specify otherwise • The ipconfig /all command will indicate whether the configuration came from a DHCP server computer
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
3
DHCP Overview (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
4
DHCP Overview (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
5
Leasing an IP Address • An IP address is leased during the boot process • The overall process is composed of four broadcast packets: • • • •
DHCPDISCOVER DHCPOFFER DHCPREQUEST DHCPACK
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
6
Leasing an IP Address (continued) • Any DHCP server that receives the DHCPDISCOVER packet responds with a DHCPOFFER packet • The DHCP client responds to the DHCPOFFER packet it receives with a DHCPREQUEST packet • A DHCPACK packet indicates confirmation that the client can use the lease • Once DHCPACK is received, the client can start using the IP address and options in the lease 70-291: MCSE Guide to Managing a Microsoft Windows Server Network
7
Leasing an IP Address (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
8
Renewing an IP Address • The IP address can either be permanent or timed • A permanent address is never reused for another client • Timed leases expire after a certain amount of time • Windows clients attempt to renew their lease after 50% of the lease time has expired • A DHCP server may either honor or reject a renew request
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
9
Renewing an IP Address (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
10
Installing and Authorizing the DHCP Service • A DHCP service must be authorized after installation
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
11
Installing the DHCP Service • DHCP is a standard service • It is included in Windows Server 2003 • It is not installed as part of a default installation
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
12
Installing the DHCP Service (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
13
Activity 4-1: Installing DHCP • Objective: Install DHCP on Windows Server 2003 • Make sure your network connection is statically configured • Install the service using the Add/Remove Windows Components utility
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
14
Authorizing the DHCP Service • Unauthorized DHCP servers can hand out bad information • DHCP will not start unless authorized • If Active Directory is used, authorization takes place in Active Directory • DHCP servers are automatically authorized under certain conditions
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
15
Authorizing the DHCP Service (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
16
Authorizing the DHCP Service (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
17
Activity 4-2: Starting an Authorized DHCP Server • Objective: View the results of starting a DHCP server that does not participate in an Active Directory domain • Check to make sure the service is running • Check out any relevant events using the System Log
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
18
Activity 4-3: Installing the Active Directory Service • Objective: Install the Active Directory service on your computer and participate in an Active Directory domain • Use the dcpromo utility • Select “domain controller for a new domain” • Select “domain in a new forest” • Continue through the resulting dialogs
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
19
Activity 4-4: Starting an Unauthorized DHCP Server • Objective: View the results of starting an unauthorized DHCP server • View the System Log to see the result of starting an unauthorized DHCP server
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
20
Activity 4-5: Authorizing a DHCP Server • Objective: Authorize a DHCP server in Active Directory • Go to the DHCP snap-in and choose the activate option
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
21
Configuring DHCP Scopes • Scope defines a range of IP addresses • Each scope is configured with: • • • • • •
Description Starting IP address Ending IP address Subnet mask Exclusions Lease duration
• Two strategies exist for defining the starting and ending IP addresses • Allow all and exempt the few static addresses • Use only the addresses not already in use 70-291: MCSE Guide to Managing a Microsoft Windows Server Network
22
Configuring DHCP Scopes (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
23
Configuring DHCP Scopes (continued) • Exclusions are used to prevent some IP addresses from being handed out dynamically • Lease duration defines how long client computers are allowed to use an IP address • Default lease duration is eight days • A scope must be activated before the DHCP service can begin using it
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
24
Activity 4-6: Creating a Scope • Objective: Create a scope to distribute IP addresses to client computers • Manually enter the IP configuration settings as directed by the text • Create a new scope using the configuration settings provided
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
25
Activity 4-7: Activating and Testing a Scope • Objective: Activate a DHCP scope, and then test it with a partner • One person will activate the scope created in the previous activity • Another person will try to obtain an automatic IP address from the server
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
26
Superscopes • Used to combine multiple scopes into a single logical scope • Allows multiple scopes to be treated as a single scope • If a superscope is used, then the DHCP server offers only one lease as opposed to multiple leases
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
27
Superscopes (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
28
Activity 4-8: Configuring a Superscope • Objective: Combine two scopes into a single logical unit using a superscope • First, create a second scope in addition to the scope already created in a previous activity • Create a superscope to encompass the two scopes • Use the DHCP snap-in for this activity
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
29
Activity 4-9: Deleting a Superscope • Objective: Delete a superscope, leaving each scope independent • Make sure you delete the superscope without deleting the subscopes
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
30
Multicast Scopes • Used to deliver multicast addresses to applications that require it • Multicast addresses are used to deliver packets to groups of computers • Start and end IP addresses define the range of addresses that can be handed out by DHCP servers • TTL defines the number of routers through which a multicast packet can move
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
31
Multicast Scopes (continued) • Exclusions define addresses that should not be handed out • Lease duration defines the length of time that an application can use a multicast address • Default lease length is 30 days
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
32
Activity 4-10: Creating a Multicast Scope • Objective: Create a multicast scope to deliver multicast addresses to applications • Setting up a multicast scope is very similar to setting up any other scope • Set the scope configuration to that specified in the text
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
33
Activity 4-11: Deleting a Multicast Scope • Objective: Delete a multicast scope • Right click on the scope and issue the delete command
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
34
Creating DHCP Reservations • Reservations are used to hand out a specific IP address to a particular client • Useful when delivering IP addresses to devices that would normally use static addresses • Can also be beneficial when firewalls are in place • Reservations are created based on MAC addresses
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
35
Creating DHCP Reservations (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
36
Activity 4-12: Creating and Testing a Reservation • Objective: Create a DHCP reservation, and test it with a client • Configure the server to reserve an IP address for a client machine • Test to see if the client machine picks up the reserved address
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
37
Configuring DHCP Options • DHCP can hand out a variety of other IP configuration options • It is common that all workstations within an entire organization use the same DNS servers • DNS is often configured at the server level
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
38
Configuring DHCP Options (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
39
Configuring DHCP Options (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
40
Activity 4-13: Setting Server Options • Objective: Set the DNS server option for a DHCP server • Check 006 DNS servers option • Add the IP address x.0.0.250
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
41
Activity 4-14: Setting Scope Options • Objective: Set the default gateway in the scope options • Use the DHCP snap-in to complete this activity
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
42
Activity 4-15: Testing Server & Scope Options • Objective: Activate a DHCP scope, and then test it with a partner to ensure that scope options are handed out • Activate a DHCP scope • Configure a client to access the server • Check the default gateway and DNS settings to find out whether or not the configurations entered in previous activities were done correctly
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
43
Vendor and User Classes • Used to differentiate between clients within a scope • Vendor classes are based on the operating system • User classes are defined based on network connectivity or the administrator • You can use the ipconfig /setclassid command to set the DHCP user class ID
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
44
Vendor and User Classes (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
45
Vendor and User Classes (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
46
Configuring a DHCP Relay • DHCP packets cannot travel across a router • A relay agent is necessary in order to have a single DHCP server handle all leases • Relay agents receive broadcast DHCP packets and forward them as unicast packets to a DHCP server • The DHCP relay cannot be installed on the same server as the DHCP service
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
47
Configuring a DHCP Relay (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
48
Configuring a DHCP Relay (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
49
Activity 4-16: Configuring a DHCP Relay • Objective: Uninstall the DHCP service from your computer and configure it as a DHCP relay • Uninstall the DHCP service • Configure the computer as a relay by using the Routing and Remote Access tool provided in Windows
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
50
Summary • DHCP dynamically assigns IP address information to clients on a network • The DHCP lease process is composed of four packets: • DHCPDISCOVER • DHCPOFFER • DHCPREQUEST • DHCPACK • A DHCP client attempts to renew its lease at 50%, 87.5%, and 100% of the lease time • The commands ipconfig /release and ipconfig /renew can be used to release and renew DHCP leases 70-291: MCSE Guide to Managing a Microsoft Windows Server Network
51
Summary (continued) • If the Active Directory service is present on your network, each DHCP server must be authorized in Active Directory to lease addresses to clients • A scope defines a range of IP addresses that are leased to clients • A superscope combines two scopes into a single logical unit to service network segments with two subnets
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
52
Summary (continued) • An exclusion in a scope can stop a DHCP server from handing out specific addresses • A reservation allows you to give a specific workstation a defined IP address by tying the DHCP lease to the MAC address of the client • Vendor and user classes can be used to configure some client computers with different options, depending on the class to which they belong • A DHCP relay agent is required on each network that requires IP configuration from a DHCP server across a router 70-291: MCSE Guide to Managing a Microsoft Windows Server Network
53
Chapter 4: Dynamic Host Configuration Protocol
Objectives • • • • • • •
Outline the benefits of using DHCP Describe the DHCP lease and renewal process Install and authorize the DHCP service Configure DHCP scopes Create DHCP reservations for client computers Configure DHCP options Understand and describe the purpose of a DHCP relay • Install and configure a DHCP relay 70-291: MCSE Guide to Managing a Microsoft Windows Server Network
2
DHCP Overview • Used to automatically deliver IP addressing • Reduces the amount of time you spend configuring computers on your network • Used by default unless you specify otherwise • The ipconfig /all command will indicate whether the configuration came from a DHCP server computer
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
3
DHCP Overview (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
4
DHCP Overview (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
5
Leasing an IP Address • An IP address is leased during the boot process • The overall process is composed of four broadcast packets: • • • •
DHCPDISCOVER DHCPOFFER DHCPREQUEST DHCPACK
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
6
Leasing an IP Address (continued) • Any DHCP server that receives the DHCPDISCOVER packet responds with a DHCPOFFER packet • The DHCP client responds to the DHCPOFFER packet it receives with a DHCPREQUEST packet • A DHCPACK packet indicates confirmation that the client can use the lease • Once DHCPACK is received, the client can start using the IP address and options in the lease 70-291: MCSE Guide to Managing a Microsoft Windows Server Network
7
Leasing an IP Address (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
8
Renewing an IP Address • The IP address can either be permanent or timed • A permanent address is never reused for another client • Timed leases expire after a certain amount of time • Windows clients attempt to renew their lease after 50% of the lease time has expired • A DHCP server may either honor or reject a renew request
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
9
Renewing an IP Address (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
10
Installing and Authorizing the DHCP Service • A DHCP service must be authorized after installation
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
11
Installing the DHCP Service • DHCP is a standard service • It is included in Windows Server 2003 • It is not installed as part of a default installation
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
12
Installing the DHCP Service (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
13
Activity 4-1: Installing DHCP • Objective: Install DHCP on Windows Server 2003 • Make sure your network connection is statically configured • Install the service using the Add/Remove Windows Components utility
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
14
Authorizing the DHCP Service • Unauthorized DHCP servers can hand out bad information • DHCP will not start unless authorized • If Active Directory is used, authorization takes place in Active Directory • DHCP servers are automatically authorized under certain conditions
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
15
Authorizing the DHCP Service (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
16
Authorizing the DHCP Service (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
17
Activity 4-2: Starting an Authorized DHCP Server • Objective: View the results of starting a DHCP server that does not participate in an Active Directory domain • Check to make sure the service is running • Check out any relevant events using the System Log
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
18
Activity 4-3: Installing the Active Directory Service • Objective: Install the Active Directory service on your computer and participate in an Active Directory domain • Use the dcpromo utility • Select “domain controller for a new domain” • Select “domain in a new forest” • Continue through the resulting dialogs
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
19
Activity 4-4: Starting an Unauthorized DHCP Server • Objective: View the results of starting an unauthorized DHCP server • View the System Log to see the result of starting an unauthorized DHCP server
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
20
Activity 4-5: Authorizing a DHCP Server • Objective: Authorize a DHCP server in Active Directory • Go to the DHCP snap-in and choose the activate option
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
21
Configuring DHCP Scopes • Scope defines a range of IP addresses • Each scope is configured with: • • • • • •
Description Starting IP address Ending IP address Subnet mask Exclusions Lease duration
• Two strategies exist for defining the starting and ending IP addresses • Allow all and exempt the few static addresses • Use only the addresses not already in use 70-291: MCSE Guide to Managing a Microsoft Windows Server Network
22
Configuring DHCP Scopes (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
23
Configuring DHCP Scopes (continued) • Exclusions are used to prevent some IP addresses from being handed out dynamically • Lease duration defines how long client computers are allowed to use an IP address • Default lease duration is eight days • A scope must be activated before the DHCP service can begin using it
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
24
Activity 4-6: Creating a Scope • Objective: Create a scope to distribute IP addresses to client computers • Manually enter the IP configuration settings as directed by the text • Create a new scope using the configuration settings provided
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
25
Activity 4-7: Activating and Testing a Scope • Objective: Activate a DHCP scope, and then test it with a partner • One person will activate the scope created in the previous activity • Another person will try to obtain an automatic IP address from the server
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
26
Superscopes • Used to combine multiple scopes into a single logical scope • Allows multiple scopes to be treated as a single scope • If a superscope is used, then the DHCP server offers only one lease as opposed to multiple leases
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
27
Superscopes (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
28
Activity 4-8: Configuring a Superscope • Objective: Combine two scopes into a single logical unit using a superscope • First, create a second scope in addition to the scope already created in a previous activity • Create a superscope to encompass the two scopes • Use the DHCP snap-in for this activity
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
29
Activity 4-9: Deleting a Superscope • Objective: Delete a superscope, leaving each scope independent • Make sure you delete the superscope without deleting the subscopes
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
30
Multicast Scopes • Used to deliver multicast addresses to applications that require it • Multicast addresses are used to deliver packets to groups of computers • Start and end IP addresses define the range of addresses that can be handed out by DHCP servers • TTL defines the number of routers through which a multicast packet can move
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
31
Multicast Scopes (continued) • Exclusions define addresses that should not be handed out • Lease duration defines the length of time that an application can use a multicast address • Default lease length is 30 days
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
32
Activity 4-10: Creating a Multicast Scope • Objective: Create a multicast scope to deliver multicast addresses to applications • Setting up a multicast scope is very similar to setting up any other scope • Set the scope configuration to that specified in the text
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
33
Activity 4-11: Deleting a Multicast Scope • Objective: Delete a multicast scope • Right click on the scope and issue the delete command
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
34
Creating DHCP Reservations • Reservations are used to hand out a specific IP address to a particular client • Useful when delivering IP addresses to devices that would normally use static addresses • Can also be beneficial when firewalls are in place • Reservations are created based on MAC addresses
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
35
Creating DHCP Reservations (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
36
Activity 4-12: Creating and Testing a Reservation • Objective: Create a DHCP reservation, and test it with a client • Configure the server to reserve an IP address for a client machine • Test to see if the client machine picks up the reserved address
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
37
Configuring DHCP Options • DHCP can hand out a variety of other IP configuration options • It is common that all workstations within an entire organization use the same DNS servers • DNS is often configured at the server level
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
38
Configuring DHCP Options (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
39
Configuring DHCP Options (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
40
Activity 4-13: Setting Server Options • Objective: Set the DNS server option for a DHCP server • Check 006 DNS servers option • Add the IP address x.0.0.250
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
41
Activity 4-14: Setting Scope Options • Objective: Set the default gateway in the scope options • Use the DHCP snap-in to complete this activity
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
42
Activity 4-15: Testing Server & Scope Options • Objective: Activate a DHCP scope, and then test it with a partner to ensure that scope options are handed out • Activate a DHCP scope • Configure a client to access the server • Check the default gateway and DNS settings to find out whether or not the configurations entered in previous activities were done correctly
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
43
Vendor and User Classes • Used to differentiate between clients within a scope • Vendor classes are based on the operating system • User classes are defined based on network connectivity or the administrator • You can use the ipconfig /setclassid command to set the DHCP user class ID
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
44
Vendor and User Classes (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
45
Vendor and User Classes (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
46
Configuring a DHCP Relay • DHCP packets cannot travel across a router • A relay agent is necessary in order to have a single DHCP server handle all leases • Relay agents receive broadcast DHCP packets and forward them as unicast packets to a DHCP server • The DHCP relay cannot be installed on the same server as the DHCP service
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
47
Configuring a DHCP Relay (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
48
Configuring a DHCP Relay (continued)
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
49
Activity 4-16: Configuring a DHCP Relay • Objective: Uninstall the DHCP service from your computer and configure it as a DHCP relay • Uninstall the DHCP service • Configure the computer as a relay by using the Routing and Remote Access tool provided in Windows
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
50
Summary • DHCP dynamically assigns IP address information to clients on a network • The DHCP lease process is composed of four packets: • DHCPDISCOVER • DHCPOFFER • DHCPREQUEST • DHCPACK • A DHCP client attempts to renew its lease at 50%, 87.5%, and 100% of the lease time • The commands ipconfig /release and ipconfig /renew can be used to release and renew DHCP leases 70-291: MCSE Guide to Managing a Microsoft Windows Server Network
51
Summary (continued) • If the Active Directory service is present on your network, each DHCP server must be authorized in Active Directory to lease addresses to clients • A scope defines a range of IP addresses that are leased to clients • A superscope combines two scopes into a single logical unit to service network segments with two subnets
70-291: MCSE Guide to Managing a Microsoft Windows Server Network
52
Summary (continued) • An exclusion in a scope can stop a DHCP server from handing out specific addresses • A reservation allows you to give a specific workstation a defined IP address by tying the DHCP lease to the MAC address of the client • Vendor and user classes can be used to configure some client computers with different options, depending on the class to which they belong • A DHCP relay agent is required on each network that requires IP configuration from a DHCP server across a router 70-291: MCSE Guide to Managing a Microsoft Windows Server Network
53
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