Oh man, I feel dumb for not trying that. I actually had a spare switch and stuck it between the two and it works now. I'm amazed Asus doesn't have that in any of their FAQs or troubleshooting. I also contacted AT&T's support and they didn't mention it either.
For almost the past decade I've been using an old ASUS RT-AC87R with no issues. One of the antenna broke on it so I decided I would upgrade to the Asus RT-AX88U Pro. When setting it up it immediately showed the WAN port light as red on the top of the router and in the control panel it says "The...
I'm having this exact same issue. Brand new RT AX88U Pro and the WAN port refuses to recognize any cable is plugged in. I tried about 8 different cables of different types (Cat 5e, Cat 6, Cat 6a and Cat 6e) After a few hours of messing with it I finally put it into Dual WAN mode and got it to...