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Docsis 3.0 Modems and Mode of Operation
Docsis 3.0 modems will be IPv6 ready (dual stack v4 & v6)
When configured on IPv4-only CMTS, Docsis 3.0 modems will be provisioned using IPv4
when configured on IPv6-enable CMTS, Docsis 3.0 modems will be provisioned either using IPv4 or using IPv6. A mode is defined where both IPv4 & IPv6 addresses are available
In some deployment where IPv4 address space is an issue, Docsis 3.0 modems will not have both IPv4 & IPv6 addresses at the same time

UDP6
IPv6
NIC driver
Docsis 3.0
Cable Modem
NIC driver
UDP4
IPv4
or
Docsis 3.0
Cable Modem
UDP6
IPv6
NIC driver
or
Docsis 3.0
Cable Modem
UDP4
IPv4
depending on an L2 config message
PPT Version