I beg to differ. I've got Comcast in the PNW, and their IPv6 stack on Business class is atrocious. A short list of the issues I've had/am currently experiencing:
- Account is registered for a /56, their router only responds to requests for a /59
- Once my CPE is configured for that /59, routing from anything smaller than that /59 is just dropped on the ground (no delegation to/from /64s, etc, is allowed)
- significant investigation later, the root cause is because I also have a /29 static v4 block on my router. Removing the v4 block from the Comcast end, everything works great (as a /59). As soon as the Comcast equipment receives the static v4 config, v6 delegation grinds to a halt
- Comcast Business Support is WOEFULLY under-trained on v6. Talking about v6 netblocks gets me strange stares and "But I see your /29 on the account, is that what you're talking about?"
- Comcast line-managers have told me on multiple occasions, "Oh, if static-v4/v6 doesn't work, then it's just not supported. Sorry, just take your business elsewhere if static is important to you"
Disagree. Unlike their IPv4 setup, where the IP rarely changes, the IPv6 address constantly changes for no apparently reason. This makes it hard to whitelist IPs or to set up an internal IPv6 network.
I ended up getting an IPv6 /48 from Hurricane because of the hassles. That works great (other than having to force Netflix to IPv4 because of their dumb IP block).
If Comcast offered static IPv6 (NOT via business class), and more than a /60 (/58 at least), that would make it "work great".
- Account is registered for a /56, their router only responds to requests for a /59
- Once my CPE is configured for that /59, routing from anything smaller than that /59 is just dropped on the ground (no delegation to/from /64s, etc, is allowed)
- significant investigation later, the root cause is because I also have a /29 static v4 block on my router. Removing the v4 block from the Comcast end, everything works great (as a /59). As soon as the Comcast equipment receives the static v4 config, v6 delegation grinds to a halt
- Comcast Business Support is WOEFULLY under-trained on v6. Talking about v6 netblocks gets me strange stares and "But I see your /29 on the account, is that what you're talking about?"
- Comcast line-managers have told me on multiple occasions, "Oh, if static-v4/v6 doesn't work, then it's just not supported. Sorry, just take your business elsewhere if static is important to you"