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Hello may (legally) occur situation when router is not sending router advertisements but is providing configuration via DHCPv6?

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Reset to default
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According to RFC4862, Sec 5.5.2 this can happen. However:

  1. DHCPv6 does not have an option to provide address of default gateway (explained at the same reference), so in this case default gateway must be configured manually.
  2. if the router want to disable SLAAC and use DHCPv6 instead, the proper way would be to use a special bit in router advertisement, that disables SLAAC. To do this you set M flag (AdvManagedFlag) on the router advertisement and disable all A flags (AdvAutonomousFlag) on each prefix. See RFC4861 for the description of flags. More info here
  3. you might want to consider this link as well.
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