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 Use DHCP Servers, Relay Agents, and DHCP/BOOTP. Create DHCP scopes. Prevent unauthorized servers and users. Grant management permissions carefully. Improve availability and performance.