[SOLVED]IPV6 address drops when dhcp renews

[norgan]

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2021-03-24T18:11:56 opnsense[5694] /usr/local/etc/rc.routing_configure: The command '/sbin/route add -'inet6' default ''' returned exit code '71', the output was 'route: : Name does not resolve'
2021-03-24T18:11:56 opnsense[5694] /usr/local/etc/rc.routing_configure: ROUTING: creating /tmp/re0_vlan99_defaultgwv6 using ''
2021-03-24T18:11:56 opnsense[5694] /usr/local/etc/rc.routing_configure: ROUTING: removing /tmp/re0_vlan99_defaultgwv6


If i reboot it works fine for a few minutes then this happens and I lose the ipv6 address on the wan interface and no routing to public ipv6 endpoints.

This seems to have been caused by the addiional of the DHCP_IPV6 interface in the gateway group. My intention was to failt to v4 if v6 fell over. It actually caused the v6 address to drop at dhcp renewal.