Chapter 8: DHCP in IP Configuration Designs

1. Chapter 8: DHCP in IP Configuration Designs • Designs That Include DHCP • Essential DHCP Design Concepts • Configuration Protection in DHCP Designs • DHCP Design Optimization

2. DHCP and Microsoft Windows 2000 • Dynamic Host Configuration Protocol (DHCP) provides automatic IP configuration. • Windows 2000 includes DHCP services. • DHCP Client • DHCP Server • DHCP Relay Agent

3. DHCP Services

4. DHCP Design Review • Collect requirements. • Base decisions on • The amount of data • The number of segments needing automatic IP configuration • Future growth • Router placement • Router broadcast traffic forwarding • Wide area network (WAN) connections

5. DHCP Design Decisions • Types of clients supported by DHCP • IP configuration method for segments • Placement of DHCP Servers and DHCP Relay Agents • Methods for providing DHCP automatic IP configuration • Optimization methods

6. IP Configuration Designs • Most are for routed networks • Methods to configure IP information include • Manual configuration • Third-party DHCP services • Windows 2000 DHCP services

7. Windows 2000 DHCP Services • Are integrated with Windows 2000 services • Can be used with other operating systems • Prevent DHCP configuration errors • Are highly available • Are integrated with the Active Directory directory service

8. Determining Automatic IP Configuration • Use automatic IP configuration for all computers except • File servers, print servers, database servers, and Web servers • Network backbone segments containing only routers • WAN segments • Screened subnets (DMZs)

9. DHCP IP Configuration Methods • DHCP server • DHCP Relay Agent • DHCP/Boot Protocol (BOOTP)

10. DHCP Servers

11. DHCP Relay Agents

12. DHCP/BOOTP Router Forwarding

13. DHCP Scopes • Use scopes to define a range of managed IP addresses. • Create a scope for each address range. • Group multiple scopes to create superscopes. • Specify the DHCP IP address lease length.

14. DHCP IP Address Lease Length • Specifies when an IP address becomes available • Increasing the DHCP lease length • Makes the address unavailable longer • Decreases DHCP traffic • Decreasing the DHCP lease length • Makes the address available sooner • Increases DHCP traffic

15. Excluding IP Addresses from the Scope • Exclude any manually assigned address. • IP routers • Firewalls • File, print, and application servers • Gateways • Non-DHCP configurable devices

16. DHCP Scope Options • Are client configuration parameters • Define what the administrator can assign • Can be assigned to levels • Server options • Scope options • Class options • Client options

17. Preventing Unauthorized DHCP Servers

18. Preventing Unauthorized Users • Prevent unauthorized access. • Restrict DHCP administrators. • Isolate DHCP servers from public networks.

19. Enhancing DHCP Availability • Use Windows Clustering. • Distribute DHCP scope across multiple servers. • Dedicate a computer to DHCP.

20. Improving DHCP Performance • Load balance across servers. • Modify the lease length. • Dedicate a computer to DHCP.

21. Chapter Summary • Use DHCP integrated in Windows 2000. • Use DHCP Servers, Relay Agents, and DHCP/BOOTP. • Create DHCP scopes. • Prevent unauthorized servers and users. • Grant management permissions carefully. • Improve availability and performance.