Respond to all dhcp-server-identifier toggle
Some datacenter type deployments use proxy services to modify some dhcp options. These deployments make use of the dhcp-server-identifier option to know if they should modify such data and which data to modify. When configuring Kea, it is possible to change the dhcp-server-identifier option content via several methods. Kea, unfortunately, will not respond to the client REQUEST when it is bound for a different dhcp-server-identifier that contains an IP address that is not configured on the Kea server. Note that this IP address content in the modified dhcp-server-identifier option most likely won't exist on the Kea server either. Datacenter deployments use this method so that a team that is responsible for PXE boot content can make changes without a team responsible for the DHCP server needing to be involved.
To resolve this, it is requested that a new compatibility configuration flag be added to Kea that causes the server to respond to all DHCP packets regardless of the content of the dhcp-server-identifier contained therein. It should be noted that this breaks RFC 2131.