User Guide

Planning 67
Novell DNS/DHCP Management Utility Administration Guide
103-000164-001
September 4, 2001
Novell Confidential
Manual 99a38 July 17, 2001
Controlling Client Access to Leases
There usually is a trade-off when an attempt is made to control specific client
access to leases. Typically, you would manually configure each client and
dedicate an IP address permanently to each client. Novell's DHCP server,
however, provides control based on the client's hardware address.
IP Address Availability
This section describes how to identify your IP addresses, how to subnet your
addresses, what to do with addresses assigned by other sources, and how to
restrict address assignments to clients.
Identifying Your Addresses
If you have been using a previous version of Novell DHCP, another vendor's
product, or another method of tracking your IP address information,
information about your addresses should be close at hand. We recommend
verifying the accuracy of your IP address records by performing a site audit to
prevent communication problems.
If you are unsure of the range of your IP addresses, we recommend contacting
your Internet Service Provider (ISP) or checking other records you have on
file.
6 hours Covers a DHCP server outage of 6
hours
12 hours Ensures that retraction of address
assignment takes less than one day
3 days Used by many sites simply because
of software defaults
6 days Affords a weekend server outage
without losing leases
4 months Enables students to keep their
address over a summer vacation, for
example
Lease Time Rationale