According to Time Warner (or Spectrum as they are now called), they are ready for IPv6: https://www.timewarnercable.com/en/support/internet/topics/ipv6.html, at least for customers that have dynamically assigned IP addresses.
And sure enough, if a computer is directly to the modem, the computer is assigned an IPv6 address in addition to an IPv4 address.
However, when IPv6 is activated on the Cisco ASA 5500 series:
interface vlan2 !--- my 'outside' interface ipv6 enable
Communication from the service provider's modem to the ASA promptly ceases (i.e. IPv4 connectivity is lost as well).
If the following configuration change is made:
interface vlan2 no ipv6 enable
IPv4 connectivity resumes.
Obviously the ASA has plenty of options for configuring IPv6. Perhaps there is something missing? Perhaps the service provider has a draconian filtering policy?
Has anyone had any experience getting IPv6 to work with cable internet service providers? Did they have to do anything special?