*Turn off DHCP in both HDAs. Allow DD-WRT to handle DHCP.<br/>
First enable '''Settings''' | '''Advanced Settings''' in your HDA's Dashboard (circled red):
[[File:settings.jpg]]
In the '''Network''' section select '''Settings''' and ''untick'' the '''DHCP Server''' checkbox (circled in red) from '''both''' HDAs.
[[File:dhcpserveroff.jpg]]
Under "Services > DHCP Server" in DD-WRT set "Used Domain" to "LAN & WAN"<br/>
Give the router's LAN a name and assign static DHCP leases for each HDA using the real MAC address, hostname and IP of each.<br/>
*DO NOT turn off DNS on ''either '' HDA.<br/>
*DD-WRT Dnsmasq config. The DNSMasq feature in DD-WRT allows you to direct DNS requests to the each of the DNS servers of the respective HDAs. This prevents one HDA from taking over DNS and preventing the other from using its DNS driven apps.<br/>