Hi!

Our HOA has recently upgraded our fiber network, and switched to a new ISP on monday. Since then—literally since they flipped the switch, I guess—I've not been able to get the router to work as intended; the only way I've been able to access the internet through my router is by connecting it to the main outlet through a LAN port rather the WAN port, cloning my main laptop's MAC address, and disabling the DHCP server on the router.

This cludgy workaround has some major drawbacks ofc—not least of which is that we can only reliably use 3 devices at a time (the number of IP addresses we're limited to by our ISP). The ISP's tech support says they've run extensive diagnostics, and cannot see any issues with their hardware or software. I don't think they've restarted the switch responsible for our apartment since this problem began. 

Initially, connecting other devices directly into the main ethernet jack did not make a difference, but now it looks like a laptop connected that way can at least get an IP address and access the internet. My router, however, cannot get an IP address, irrespective of whether it's connected via the WAN port or a LAN port. 

In short, my ISP's tech support believes some software issue on my router—even on factory settings other than network ID & password—is preventing it from requesting or accepting the necessary parameters from their switch. 

I've never encountered a problem exactly like this before. The only other time I've experienced something similar, someone had to reboot the switch responsible for our apartment, presumably to flush the cache? I don't know. Anyway, I would really appreciate any and all advice you might have for how to diagnose and pref. solve this problem. Working from home isn't going very well this week :)

Thank you in advance