I have been reading a lot of the threads on setting up a Power BI/POE system and am stuck at setting up the LAN security and DDNS server so I can access my cameras off my home network. My incoming network is via an ISP, into a cable modem that goes into my Asus RT-AC68P router. I am unable to set up my DDNS server and thus use a VPN because I don't know the static IP address assigned to me by my ISP. What is the best way around this to access my cameras, while securing myself, my home network, and my cameras? Thanks.