Good morning pswired,
Thank you for your update and sharing the steps you took to re-enable functionality. I sent your notes back to the engineers so they have it for reference.
Are you able to take a packet capture from your sonicwall's WAN interface to see if your inbound connection attempts are reaching the Sonicwall?
Interesting. When I was having problems, the ICMPv6 pings would not even make it in past the HT2000W. I think there must be something else going on here. Do you have a laptop or something you could plug directly into the HT2000W and disable the firewall completely on? What are you using to test from (ping origin)? I have been using the Level3 looking glass here:
Using the Atlanta, GA site. It seems that not all of the sites are actually IPv6 enabled.
One note: ICMPv6 is a core part of IPv6 functionality, so network operators can't get away with blocking it wholesale like they could with IPv4.
Also maybe open up remote admin on your sonicwall and try to make a http/s connection via IPv6. But don't leave it open for long since your IP is posted above
Yup agree... Will check.. In the meantime
This will allow you to ping your HW modem (I'm using Pingdom to alert for connection issues).
I have no idea how "static" this ipv6 address is....