charon.plugins.dhcp.force_server_address = no
	Always use the configured server address.

	Always use the configured server address. This might be helpful if the DHCP
	server runs on the same host as strongSwan, and the DHCP daemon does not
	listen on the loopback interface.  In that case the server cannot be reached
	via unicast (or even 255.255.255.255) as that would be routed via loopback.
	Setting this option to yes and configuring the local broadcast address (e.g.
	192.168.0.255) as server address might work.

charon.plugins.dhcp.identity_lease = no
	Derive user-defined MAC address from hash of IKE identity.

charon.plugins.dhcp.server = 255.255.255.255
	DHCP server unicast or broadcast IP address.

charon.plugins.dhcp.interface
	Interface name the plugin uses for address allocation.

	Interface name the plugin uses for address allocation. The default is to
	bind to any (0.0.0.0) and let the system decide which way to route the
	packets to the DHCP server.