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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9  TCP/IP Network Configuration and Management Protocols (BOOTP, DHCP, SNMP and RMON)
           9  Host Configuration and TCP/IP Host Configuration Protocols (BOOTP and DHCP)
                9  TCP/IP Dynamic Host Configuration Protocol (DHCP)
                     9  DHCP Address Assignment and Dynamic Address Allocation and Management

Previous Topic/Section
DHCP Lease "Life Cycle" Overview (Allocation, Reallocation, Renewal, Rebinding and Release) and Lease Timers
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Pages in Current Topic/Section
12
3
4
Next Page
DHCP Configuration and Operation
Next Topic/Section

DHCP Lease Address Pools, Ranges (Scopes) and Address Management
(Page 3 of 4)

Simple Address Assignment For a Single Scope

The exact method for setting up scopes depends on the particular operating system and DHCP server software, and I am not going to get into that here. However, each scope definition typically begins by specifying a range of addresses using a starting and an ending IP address. For example, if a company was assigned the IP address block 111.14.56.0/24, the administrator might set up a scope encompassing addresses 111.14.56.20 through 111.14.56.254, as shown in Figure 260. Then for that scope, the administrator can set up various parameters to be specified to each client assigned an address from the scope.


Figure 260: DHCP Scope

 


Why not start at 111.14.56.1? Usually we will want to set aside certain IP addresses for manual configuration of servers, routers and other devices requiring a fixed address. One easy way to do that is to simply reserve a block of addresses that aren't used by DHCP. Alternately, most DHCP server software will allow you to specify a range but exclude an address or set of addresses from the range. So we could specify 111.14.56.1 through 111.14.56.254 and individually mark as “not available” addresses we manually assign. Or specify that 111.14.56.1 through 111.14.56.19 are reserved.


Previous Topic/Section
DHCP Lease "Life Cycle" Overview (Allocation, Reallocation, Renewal, Rebinding and Release) and Lease Timers
Previous Page
Pages in Current Topic/Section
12
3
4
Next Page
DHCP Configuration and Operation
Next Topic/Section

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Version 3.0 - Version Date: September 20, 2005

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