I’m trying to configure IPv6 on my Comcast cable modem (docsis3). I’ve been able to do it before, but now I’m getting this message:
Couldn’t add New DHCPv6 Client - no request IA configured >
>
Has anyone seen this before? 
Thanks,
-tp
You currently have to add the ipv6 dhcp client via the terminal. The GUI does not have a way to set the request type (address and/or prefix).
example:
/ipv6 dhcp-client add interface=ether1 request=address,prefix pool=test
If you have request include prefix, then you must set a pool.