The one place for your designs
To upload designs, you'll need to enable LFS. More information
There is no manual entry for this. The idea is to get some control on the broadcast address used to send responses to on-link clients. A priori not a bad idea. BTW the limited broadcast address is 255.255.255.255 and is not forwarded by routers (so the name) but the ISC DHCP option takes an IPv4 address (vs a boolean).