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In the off chance someone comes along with a similar problem:

I've still no idea what the issue was, but they sent out a tech who simply swapped the ONT with another one from their truck and then everything just worked. Why the bad one worked with everything but OPNSense, I have no idea. Realize this isn't the most helpful solution, but is what I got.

New user here and upfront I mostly just know enough to get into trouble, so hoping someone can help me get out of it :)

TLDR; My ISP (Ziply) came out and replaced my old ONT and now I no longer get an IP address or seem to resolve the WAN at all. Swapping to my old router works fine, and if I plug my local LAN into the WAN of OPNSense that also resolves fine. So I've got a configuration issue somewhere with the new hardware but I don't know how to figure out what it is. Hoping someone can help or point me in the right direction.


The Context:
Recently discovered OPNSense when planning to upgrade my internet from 1Gbps to 5Gbps as my Ubiquiti Edge Router4 wasn't going to be able to handle the increased speeds and buying an old Intel multi-port 10G NIC to shove into the ProxMox server I also wanted to build seemed way better than trying to find an affordable 10Gb router. This all worked mostly just out of the box with the previous gear. I am passing through 2 of the 4 ports on the Intel NIC directly to OPNSense, and mostly running with the default settings. I did set up Wireguard and created some site-to-site connections with my immediate family which has all been working flawlessly.

Fastforward to a couple of days ago when my ISP (Ziply) was able to send a technician out to my house to replace the old gear fiber gear I had from the previous company with their brand new stuff capable of 10Gbps fiber. Sadly, after they switched me over to the new Nokia XS-010X-R my internet completely stopped working. Tech was not familiar with actual network configurations and after confirming that plugging the ONT into their laptop worked fine, left. Since then I've switched back to my old EdgeRouter4, which also works just fine if you ignore the fact it cannot do more than 1Gbps.

Things I've tried so far after trying to find a solution online:
* Completely opened up the firewall with a * * * rule for IPv4/IPv6
* Left it plugged in for a couple hours in the hope it "magically fixed itself" (surprising number of posts claiming this worked for them)
* Hardcoded the IPv4 IP to what ISP claimed it was supposed to be instead of DHCP
* Spun up a brand new build of OPNSense to try from clean install
* Plugged my LAN into the WAN port of OPNSense box, it got an IP address immediately so that still is working
* Unchecked the BOGON and LAN Subnet filters on the WAN configuration just in case.
* Spent several unhelpful hours on the phone with ISP Not-Quite-Tech support, who told me my connection was great and that their diagnostics were showing everything was fine to my router, even after I'd physically unplugged the thing just to see how accurate their "diagnostics" actually were >.<

At this point I am pretty confident that my issue is a configuration one, I just have no clue where or how to go about fixing it right now. I've never had to troubleshoot a Modem/ONT device before and am unsure where to start. The ONT is obviously theirs, so I'm not sure what ability I have to connect to it myself, but am willing to pester their support to do it themselves if I have some kind of concrete directions to follow, especially if that means they become willing to bounce me to someone who actually knows what they are talking about :)

Any help or direction at all at this point is much appreciated, would REALLY like to get back to using OPNSense as not having Wireguard or all the other configuration changes I made is really annoying even after only having had them all for about a month :)

Thanks!
~Bob