Followup after 3 months. It still fails to pass traffic between the two SSIDs. I have to reboot the router about once a month to restore the functionality. Once rebooted, it works fine again (until it doesnt). Its definitely just cross traffic between the two SSIDs- traffic to the LAN ports...
Do you know if it was a fix in that version of code? That's great if so. I'm on that version now, so I'll keep the config as-is and see if it works longer term. If not, I'll adopt the guest wifi for the IOT stuff.
(I edited my above post as that was presumptuous of me to assume. )
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Thanks for that link. I swear I searched for this! I just didn't search the right way. Looks like there's a hardware bug with this router.... dang. <edited as I may be mistaken>
Thanks for the suggestions on using the guest wifi for the 2.4Ghz!! That's simple and brilliant. I'll do that for...
I have a RT-AX86U Pro, and I have two separate SSIDs: one on 5GHz, one on 2.4GHz. I had to do this because of a sprinkler controller (Rachio) that doesn't work well with the shared 5/2.4 SSID configuration.
The problem I'm having is that hosts on the 2.4G SSID can't talk to hosts on the 5GHz...