Size of DHCP-PD change
For a while now, IPv6 has been "buggy" for my Comcast connection. For example, IPv6 websites like Facebook and LinkedIn loaded slowly, if at all. Today, I was finally able to do some debugging. And what I found was that somehow the prefix that my firewall received from the cable modem changed. I used to get:
now I get
note that both are within the same "static" /56 assigned to my modem. So the IPs assigned by Comcast to the modem haven't changed.
Great... larger prefix. but the end result was that the cable modem no longer routed the IPv6 addresses I used inside my network. To make things a bit more tricky to debug: The cable modem just dropped the packets (not sure outbound or returned). In the past, I at least got an ICMPv6 "egress error" to help me debug this.
- Can Comcast provide any advance notice about configuration changes like this?
- Why do the DHCP dance at all? I still haven't quite figured out how to failover between firewalls with IPv6 if I have to request a prefix first, and may not get a consistent prefix back. Works fine with IPv4 but not at all with IPv6 in the current setup.