You cannot set any additional DHCPv4 options. DIR-827 only has a basic dhcp server and does not utilize a full blown one that would allow you to utilize advanced features such as options 66 and 67. I was actually surprised when I found out that their dhcp server supported reservations. Perhaps, you could call tech support and suggest that as a new feature set. Not sure if it makes sense for an over-the-counter router for home use for the average user--but you could try to convince them. Why, do you wish those option sets? I guess for a VoIP phone or similar device.