DHCP Fixed address to be used in device tubes

Sets a fixed IP for the server/printer/AP to facilitate the location of the transport dimensions.

Printers, APs, servers can be painfully located if every address they have is changed. Reservation allows these key devices to receive the same IP for good. It is recommended that "fixed reservation" and "asset counter account" be connected: MAC and purpose in equipment counter accounts, DHCP automatically sends it under desk, avoiding manual maintenance of two easily error lists.