Hi,
this bug has been around for awhile. I have been reminded of it when I restored a UTM9.x config after a rebuild. The original config had a dual stack native IPv6 external network. The new configuration has a native IPv4 and a sixxs tunnel. The bug being the dual stack IPv6 address details remain in the configuration even though I have a sixxs tunnel active. There is no way of being able to remove the incorrect IPv6 address details. This allows for a strange ipv6 default gateway. Which passes some traffic before giving up. The IPv6 DNS entries are from another ISP.
No IPv6 details showup on the external interface when tested. Turn off the tunnel and traffic passes.
editted and added text.
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