IP Address Re-Offer Cooldown
name: IP Address Re-Offer Cooldown
about: A configuration option to cause Kea to not offer the same address to different clients for a configurable period of time.
Kea can, in certain situations, offer the same address to multiple clients in a short period of time. These situations include (but may not be limited to):
- High DHCP client traffic, high network latency
- Kea servers without HA, with overlapping pools, connected to a shared lease database. The more pool overlap, the more it happens.
- Nearly exhausted pools, and high client traffic.
This can cause clients to be offered an address only to receive a NAK when they request the offered address. This does not break RFC but does produce extra traffic (and logs) as the clients must then attempt another 4-way handshake.
A possible solution to this is a configuration option that allows a configurable period of time, during which an already offered address will not be offered to any other clients.