You can exclude those addresses so they are not used.
1. In either the Server Manager or the DHCP Console with DHCP Server
IPv4 visible, in the console tree on the left, open IPv4; open the scope
where you want the exclusions; right-click Address Pool; and click New
Exclusion Range.
2. In the Add Exclusion dialog box, enter the IP addresses to exclude from the
scope you are working on. These can be either a range, by entering a starting
and ending address, or a single address, by entering it in just the Start IP
Address box, as shown next. You should enter an exclusion for each static
address that has been assigned to a server, workstation, or router.
3. Click Add after entering each exclusion address or range. When you have
entered all exclusions, click Close.
Set DHCP Lease Duration
DHCP address leases are for a fixed amount of time, which is set for a specific scope and
is the days, hours, and minutes that a client can use an IP address assigned to it.
1. In either the Server Manager or the DHCP Console with DHCP Server IPv4
and the scope you want to set visible in the console tree, right-click the scope,
and click Properties.
169 Chapter 6: Setting Up and Managing a Network
2. In the Scope Properties dialog box, under Lease Duration, enter or click the
spinners for the days, hours, and minutes you want to allow a client use of an
address.
The default is 6 days, but the correct time for your operation could be
anywhere from 1 hour for clients mainly jumping on and off a mail server, to 4
days for clients who are mainly traveling mobile-computer users, to Unlimited
for clients in a stable desktop environment.
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