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Hello. I am new here as well.
Maybe check out section 4 of this post: https://forum.opnsense.org/index.php?topic=42985.0
Basically, when you have the router-behind-router situation you're describing, things get messy.
While you're still setting up and getting familiar with OPNsense, perhaps put DNS on the back-burner. Once you patch the WAN interface to your ISP (removing the router-in-the-middle) DNS should just work; you can make adjustments from there.
Another suggestion - don't bother patching the WAN interface of your OPNsense box to anything until you're ready to replace your existing router.
Maybe check out section 4 of this post: https://forum.opnsense.org/index.php?topic=42985.0
Basically, when you have the router-behind-router situation you're describing, things get messy.
While you're still setting up and getting familiar with OPNsense, perhaps put DNS on the back-burner. Once you patch the WAN interface to your ISP (removing the router-in-the-middle) DNS should just work; you can make adjustments from there.
Another suggestion - don't bother patching the WAN interface of your OPNsense box to anything until you're ready to replace your existing router.
