AT&T NVG510 - Can't Disable DHCP, Can't Reserve IP Address

[ljherskowitz]

Hello,
I just changed my internet service to AT&T UVerse. I have a NVG510 router. A couple of people have already found that this router can't disable DHCP. And I cam across https://wiki.amahi.org/index.php/Airport_express which says how to go around this problem.
I can find the DHCP Starting and Ending IP Address input under Subnets & DHCP called DHCPv4 Start Address and DHCPv4End Address. However I can't find where to Create a DHCP Reservation. I did find a forum post under AT&T that says this isn't allowed.
Has anyone used this workaround with the NVG510?

[bigfoot65]

No need to create the DHCP reservation. Make the start/stop DHCP address for the IP of your HDA.

For example an address of 192.168.1.10 would be set as start/stop = 10.