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Sadly I've got exactly the same problem. My OPNsense requests a DHCPv6 Renew about every minute which results in IPv6 periodically working for six minutes always, then IPv6 drops out for 9 minutes every time and then it repeats.
Being able to manually adjust the DHCPv6 request interval would almost certainly fix this since DHCPv4 runs perfectly fine on its 10min lease requesting a new address every 5min.
Really frustrating to debug..
Being able to manually adjust the DHCPv6 request interval would almost certainly fix this since DHCPv4 runs perfectly fine on its 10min lease requesting a new address every 5min.
Really frustrating to debug..
