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Commit de44c6aef249 ("interface: T7379: do not request SLAAC default route when
only DHCPv6 is set") introduced a behavioral change while addressing an earlier
issue fixed in e9fb2078d5ea ("interface: T7375: SLAAC assigned address is not
cleared when removing SLAAC").
This change caused unintended connectivity loss after upgrading to VyOS 1.4.3.
The underlying reason is that VyOS now requires explicit configuration to
determine how IPv6 addressing and routing should be handled, rather than making
assumptions: Requesting a DHCPv6 address alone will correctly assign an address.
However, since the IPv6 default route is typically advertised via SLAAC (and not
DHCPv6), SLAAC must also be explicitly enabled to receive the default route.
Historically, this distinction was implicit and did not require additional
configuration.
To preserve backward compatibility, a configuration migrator has been added.
It inspects existing configurations that only request a DHCPv6 address and
automatically appends the required CLI node to also enable SLAAC, ensuring that
the default route is restored after upgrade.
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