Cisco Network Registrar  Unavailable Leases in Cisco Network
Registrar  Cisco - Unavailable Leases in Cisco Network Registrar
Document ID: 18934  Updated: Oct 26, 2005    When the Dynamic
Host Configuration Protocol (DHCP) server runs, some leases show
up as unavailable. There are several reasons, almost always
noted clearly in the DHCP logs:    • Ping before offer is
enabled.    • The DHCP server received a DHCPDECLINE message
from a DHCP client to which it had leased what it thought was a
good IP address.    • The Cisco Network Registrar (CNR) DHCP
server sees a message that is directed to another DHCP server.
The quick fix is to force the leases to become available. This
is not recommended, since investigation is required to find why
the leases were marked as unavailable. Go to the CNR logs
directory and look for the DHCP logs. The server makes it clear
why the IP address is marked unavailable.    Readers of this
document should have knowledge of these topics:    • How DHCP
works    • CNR command line in