CG3000DCR not routing /64 subnets of my /56
Configured my Comcast CG3000DCR for IPv6 not using DHCPv6. Configured my Firewall (Netgear FVS318Gv2) IPv6 WAN address to match the CG300DCR LAN IPv6 address segment. From my firewal, I can ping and traceroute to anything on the network. From my Firewall LAN attached systems, I can ping both the firewall LAN IPv6 address (my IPv6 Default GW address), and I can ping the Firewall address that is on the same IPv6 segment as the CG3000DCR's LAN interface, my firewall's Default GW address.
So a ping to the actual CG3000DCR LAN IPv6 address, or ANY other IPv6 address results in an error 5. It appears to be saying that the source address is not on a segment that I allocated--even the source address is contained in the /56 allocation the CG3000DCR received from Comcast.
How does one get past this behavior?