Multiple DHCP servers can share a shared network when they run in High Availability (HA) mode or when they are connected to a shared lease database. Servers in HA mode or with a shared lease database typically have the same shared network configuration (i.e. the same subnets, DHCP options, and other DHCP-specific parameters); however, there are valid cases when the shared network configurations differ on individual servers. For example, interfaces used for subnet selection may have different names.
The detailed address utilization statistics use the following naming conventions:
There are rare cases when a Kea server can return inconsistent statistics, with the number of declined leases greater than the number of assigned leases. This may happen when some DHCP clients decline leases that are already released or expired; these leases are not counted as assigned, but the declined statistics are affected. Stork deals with such cases via the "uncertain leases" count, which holds the estimated number of leases for which it is unclear whether they are allocated, declined, or free. This statistic is only computed and presented when the number of declined leases is greater than the number assigned.
The DHCP parameters can be specified at both the global and shared-network levels. The list below contains all parameters configured for all servers owning the shared network, and at both configuration levels, with an effective value displayed next to the parameter name. Click the button to the left of the parameter name to view the values specified at the different levels for each server. The shared network-level value takes precedence over the global value.