I've tried to get it to work in the past, and finally just switched to a different platform for my "firewall". It's just really really broken in RHEL6/7 derivatives to try to get dhcp-pd to work properly without a lot of jank and external script hooks that are fragile at best without writing something actually stateful to manage the changes at the kernel level + userspace along with interacting with the distribution's network config manager. If you really want to do it, you'll need to switch to a different dhcp flavor like ISC and then write some hook scripts, or you have to swap to a different network configuration management structure. Alternately, you'll likely have a better experience with an edgerouter X or Ubuntu. All that said, it's been a while, so things might be better now? I'd ask on the ISC lists or stackexchange/reddit maybe to see. On Wed, Feb 22, 2017 at 9:41 PM, Bryan Holloway <bryan@shout.net> wrote:

What endpoint do you have? Some of Comcast's devices -- notably the SMCD3G-CCR -- have a broken IPv6 PD implementation.

On 2/22/17 6:55 PM, Jared Mauch wrote:

...

It may be helpful to look at the forums at UBNT. They have details of how to make it work on their edge router platform which is a Linux box underneath.

Jared Mauch

...

On Feb 22, 2017, at 6:59 PM, Harry Hoffman <hhoffman@ip-solutions.net> wrote:

Hi Folks,

I'm wondering if anyone has successfully configured prefix delegation on Comcast's service using CentOS 7 as a router/firewall.

I'm trying to help troubleshoot a configuration and I can't find anything current via Google.

Cheers, Harry