BGW320 public static IP block
I'm an AT&T Fiber customer with 1gig service. I want to test out hosting some of my own infrastructure and asked AT&T for a public subnet to do it on. I've paid for a public static IP block (X.X.X.56/29) and configured it in my BGW320 as follows:
I've assigned through the fixed allocation DHCP the .57 address to an machine connected to the BGW320 via the LAN ports, and while it gets DHCP and can ping the gateway (.62), it does not have any network access beyond that. I've had the same result with both an OPNSense box and a Macbook.
I've disabled the firewall, packet inspection, etc., and have also not configured any IP passthrough. I can ping the .57 box from other machines both on the public subnet while connected to the BGW, as well as from machines behind the BGW320's NAT on the broader "home" network. This has stumped me, ATT support, and the 2 different techs who have come out to my house.
It feels like there is a route missing that links my public subnet with my router and the broader ATT network. I would appreciate any help in either how to properly setup my public subnet, or even how to further troubleshoot the situation.
I had considered setting up my OPNSense box as a cascaded router, but after one of the many tech visits I no longer have that option available in the UI (which seems odd). I did successfully setup the OPNSense via IP passthrough, but that only got that box the assigned router public IP and I reverted those settings. I probably could configure the OPNSense box to handle both, but I thought for a relatively simple setup (just hosting a couple servers on the public subnet), it was overkill.
Thank you in advance for any help. This has been a huge fiasco.