Windows Server 2008
Internet Protocol (IP) addresses are leased by the Dynamic Host Configuration Protocol (DHCP) server to its clients. Each lease has an expiration date, which the client must renew if it is going to continue to use that IP address. The DHCP server cannot issue leases to clients if the number of available IP addresses in the scope is insufficient.
If the DHCP server does not have IP addresses available to provide to the requesting client, then the request fails, and the client might not be able to communicate with other computers on the network. When this occurs, consider the following possible solutions:
If you already have a DHCP scope and the Start Address and End Address do not currently include all addresses for your specific subnet, you can increase the number of addresses in the scope by extending the Start Address or End Address in the scope properties.
To perform these procedures, you must be a member of the Administrators group, or you must have been delegated the appropriate authority.
To increase the number of addresses available to clients:
To reduce the lease duration:
To use a Netsh command to set the cleanup interval time:
Example
In the following example, this command sets the database cleanup interval to 10,080 minutes (every seven days).
netsh dhcp set databasecleanupinterval 10080
To verify that the DHCP server has enough IP addresses available to lease, ensure that Scope in the DHCP console tree displays a green up arrow icon.
DHCP Lease Availability (TechNet Library)
DHCP Infrastructure (TechNet Library)
Fernando Lugão Veltem edited Revision 2. Comment: added toc and tags