Yeah, I was doing some reading and saw that you had it working when in bridge mode, and mentioned that you couldn't access the control panel when it was enabled. I am able to log in to the router just fine and retrieve the following:
- Firmware Version 22.214.171.124.7-CCR
- Operating Mode RG
- System Uptime 002 days 01h:36m:10s
I'm hoping that a /56 will be an option since you can't use auto configuration if you try to subnet a /64. I really only need three IPv6 subnets and since I have a static block, I'm hoping they'll be able to accomodate.
Since everything is configured manually (statically) on my Sophos UTM, as far as I can tell, it has never seen "2001:558" nor tried to configure itself.