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Enterasys Xpedition User Reference Manual 85

Chapter 9

DHCP

Configuration Guide

DHCP Overview

The Dynamic Host Configuration Protocol (DHCP) server on the XP provides dynamic

address assignment and configuration to DHCP capable end-user systems, such as

Windows 95/98/NT and Apple Macintosh systems. You can configure the server to

provide a dynamic IP address from a pre-allocated pool of IP addresses or a static IP

address. You can also configure parameters for use by the clients, such as default gateway

and network masks, and system-specific parameters, such as NetBIOS Name Server and

NetBIOS node type of the client.

The amount of time that a particular IP address is valid for a system is called a lease. The

XP maintains a lease database which contains information about each assigned IP address,

the MAC address to which it is assigned, the lease expiration, and whether the address

assignment is dynamic or static. The DHCP lease database is stored in flash memory and

can be backed up on a remote TFTP or RCP server. You can configure the intervals at

which updates to the lease database (and backup) are done. Upon system reboot, the lease

database will be loaded either from flash memory or from the TFTP or RCP server.

Note: The XP DHCP server is not designed to work as the primary DHCP server in an

enterprise environment with hundreds or thousands of clients that are constantly

seeking IP address assignment or reassignment. A standalone DHCP server with

a redundant backup server may be more suitable for this enterprise environment.

Configuring DHCP

By default, the DHCP server is not enabled on the XP. You can selectively enable DHCP

service on particular interfaces and not others. To enable DHCP service on an interface,

you must first define a DHCP scope. A scope consists of a pool of IP addresses and a set of

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Cabletron Systems SSIM-R8-02 Specifikace Strana 105