IPv6 breaks after a while and stays DEAD after upgrading from opnsense 25 to 26

[meyergru]

What if you set the tunable sysctl net.inet6.ip6.accept_rtadv=0? Apart from the WAN, you do not need RAs on local interfaces. And you are still free to use a DHCPv6 client on WAN and/or RA server on any other interface.

[Monviech (Cedrik)]

The default route is received via Router Advertisements. Its not propagated via DHCPv6.

[meyergru]

Ah, I see. You obviously need that. IDK of a more selective RA filter that just rejects IPs.