Hello,

I have an ASUS RT-AC66U router with Advanced Tomato firmware on it. Now before that I had stock and my WAN port is currently not working so I’m stock firmware I went into WAN settings and selected LAN Ethernet port 1 as a WAN because like I mentioned my WAN port is not working. So it worked after I did that I believe it was under dual WAN. Now since I flashed Advanced Tomato that setting obviously doesn’t stay. What I want to know and I know there’s a way and it can be done but I don’t know where to go and what settings to put LAN port as a WAN. Any help would be appreciated.

Please help.

I didn't find the right solution from the Internet.

References:
https://bit.ly/2JIPPuT
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Thanks