what is a dhcp reservation
1 Type that computer's MAC address into the first entry in the DHCP Reservation setting. 2  Then, type in the IP address that you want to reserve for that machine. 3  Hit Apply, or whatever button is available to you.4  Repeat with any other computers that you want to reserve.ere's how to set up DHCP reservations on your router so that each computer in your house has the same IP address all the time. Whether you're using BitTorrent's web UI, forwarding ports for gaming, or streaming media to your phone, you sometimes need to know the IP addresses of your computers.