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Well, I tried OPNenthu's Link and I have 3 of my internal networks functional with IPV6 on Comcast. I still have more to configure but this is the most functional that I've ever had IPV6 on our networks.

So far I have had mixed results.  We have Comcast business and a /56 static IPV6 allocation. The network here is somewhat complex in that there are multiple LANs and multiple VLANs on the inside.  I was able to get one VLAN to work with IPV6 using Track Interface. When I configured a second VLAN interface with Track Interface and a prefix it started working with IPV6 as well but that broke the first VLAN - it quit working until I removed IPV6 config from the second VLAN. I haven't yet tried SLAAC.

I haven't had time to go through the logs and work on this without causing a network to be down and impact others.  I hope to try to get more info this week.

I found this guide and am hoping to try it out myself within a week or so. I'll post back with my results.

https://homenetworkguy.com/how-to/configure-ipv6-opnsense-with-isp-such-as-comcast-xfinity/