That rounded white box is a POS At&T locked down fiber modem/router which they patch biweekly at 3am without your control because they don't want people hacking their devices to change the DNS server or anything useful.
It wouldn't be a problem if AT&T let you use your own fiber ONT but they don't which is technically illegal but no one has sued them yet because they are a billion dollar company.
Thankfully the workaround is to grab a supported ONT, upgrade to 2.5g or higher fiber speeds so they are forced to use XGS-PON, then swap in your ONT with some cloned IDs and downgrade back to whatever plan you want. This all allegedly works because businesses that use AT&T as their ISP also don't want to pay money for a proprietary piece of junk, and they have enough power to throw around to demand AT&T allow them to use their own fiber hardware.
There are total bypass options now to completely remove their hardware from your network using an ONT that lets you clone the att device serial number. Just a heads up.
Thanks, I like it. $200 is a bit steep for the SFP+ unit, but if I don't have to deal with the ISPs modem nonsense, it's probably worth it. I'll probably check out the discord later.