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Unable to obtain IPv6 address via dhcp-pd
In the past I was able to obtain a /56 IPv6 address block through my Time Warner Cable Business Class connection using DHCPv6 with Prefix Delegation (dhcpv6-pd). Now that we are on Spectrum I attempted to do the same thing, but have been unable to get a block of addresses.
After turning on dhcpv6 I was assigned a /64 which will not work for our environment as you cannot split a /64 into multiple subnets, and we have several separate networks here. After configuring prefix delegation on my router and requesting a /56, I was given a /128 as expected for routing the address block, but no additional block was issued by the Spectrum DHCPv6 server. I ran a packet capture while renewing the DHCPv6 lease, and saw that the response from Spectrum's DHCPv6 server is "NoPrefixAvail". I also attempted requesting a /60 instead, in case Spectrum was no longer offering /56's, but that recieved the same response code.
Is Spectrum no longer providing larger IPv6 blocks to customers, or should I reach out to support?