[Kea-users] Subnet/pool selection
fdupont at isc.org
Mon Jan 21 23:57:50 UTC 2019
In a shared network the subnet selection in fact select the shared network.
When a host is looked up all the subnets of the shared network are scanned
starting from the selected one if there are less subnets than allowed
Pools are a bit different: they are scanned starting by the last used so
the selected subnet matters only once.
There is the code a comment explaining this mechanism:
// Need to check if the subnet belongs to a shared network. If so,
// we might be able to find a better subnet for lease allocation,
// for which it is more likely that there are some leases available.
// If we stick to the selected subnet, we may end up walking over
// the entire subnet (or more subnets) to discover that the pools
// have been exhausted. Using a subnet from which a lease was
// assigned most recently is an optimization which increases
// the likelyhood of starting from the subnet which pools are not
Francis Dupont <fdupont at isc.org>
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