![]() ![]() The real work is all being done by my ASUS Router. So, the AT&T is in the loop, but all it's doing is serving as a modem. Q: Do Asus routers support NAT loopback Answer this question. So the ASUS can recognize attempts to reach this address from inside my local network, and perform its NAT Loopback function, and everything works as desired. ASUS WiFi Router Dual Band Gigabit Wireless Router, Speed & Value, Gaming&. But here's the key: The WAN address provided to the ASUS by the AT&T is the real external WAN address of the network. In this mode, the AT&T Router just forwards all inbound traffic from the external network to the attached device (in this case, my ASUS Router). From previous searches, I understood NAT loopback function is precisely what you described. I hooked its WAN input to AT&T's Router and put the AT&T Router in "DMZ-Plus" mode. Your ISP router has the public address and when your local clients try to reach home assistant via external pubic ip address, it should handle this internally using NAT loopback, not your wifi router. It turns out that I had (lying around) an ASUS RT-N56U dual-band wireless router. This feature allows one to have a server (for instance) in their local network, and reference that server by the external IP address (or domain name) of the WAN network. A router with the NAT loopback feature detects that 202.96.128.5 is the address of its WAN interface, and treats the packet as if coming from that interface. NAT Loopback (aka "hairpinning" or NAT Reflection) is a "feature" of some (not all) routers that when the external IP (WAN) address of the network is referenced (from the client side of the router), the router recognizes this as a "special case" and loops the request back into the local network, through the firewall. For anyone that comes upon this thread, here's "the rest of the story".
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