Hi,
I have changed IPv6 tunnel providers and have gone from a /48 to a /56 address range.
Slowly moving both vlans onto the new address ranges. I configured one interface with the new address and configured the DHCP6 server all goes well. Internet access speed has improved no end
Decided now that all has settled I will now add IPV6 to the second VLAN, that was when things went down hill, access to webadmin using IPv6 stopped. Not to be foiled I logged in using IPv4 address, full high speed access, check various logs, some odd entries in the IPv6 log, but I think a restart of my PC fixed that.
Removed all of the second interface IPv6 configuration, IPv6 access worked again. Configured the seconded interface again, but without DHCP6 and webadmin stopped. Loggged in using IPv4, open the network security display and found that my PC's IPv6 address was being classified as spooffed. Turned off spoofing and all is well again.
Ian