How to keep same DDNS with different router?

[EkS]

I had to RMA my N66 and well Asus sent me a different one. But is there a way to keep my old DDNS domain? It keeps saying my old one is registered already.

 

[stevea]

Try setting the WAN-side MAC address to match the old unit.

I believe you can do this on the Asus firmware - it's called something like "clone mac address"