DHCP6 and autoconfig work in tandem not in opposition! dhcp6 does not
provide a default gateway: it depends on router solicitation/router
adverts for that
Tl;dr the network/site admin will ensure that router adverts are being
sent periodically. The adverts will have either Autonomous or Managed
bits set and that is what tells the host to use SLAAC or to use DHCP6
dan
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