I have 2 routers. 1st one is directly connected to the modem and it gets its WAN IP from ISP. 2nd router is connected to the 1st one in a DMZ configuration. For this I had to define a static IP as it's WAN IP. Now if I use dynamic DNS, my router updated the dynamic DNS site with the static WAN IP I configured. Is there a way to configure dynamic DNS on the 2nd router that it sends the address provided by the ISP?