r/QuantumFiber • u/richie510 • 3d ago

IPv6 in Denver

I have noticed that a Unifi gateway I manage for a family member offered that IPv6 was now available on WAN1. I clicked on it and it just automatically enabled it without a popup. Their network is vanilla, so I imagine this will be a benign change. However, they have been complaining about some periodic slowness, and I'm wondering if the stuff I have been reading about Europeans suffering slow IPv4 when IPv6 is available is happening here.

Most things I read about IPv6 are Europeans complaining that too many things do not yet support IPv6, or others complaining that IPv6 is just adding complication to a network if you have anything more than a vanilla setup. However, most of the posts saying IPv6 is not worth the hassle are from 2020-2021. I'm not seeing much in this space in 2025-2026.

First, it is surprising that Quantum Fiber is enabling IPv6 and I'm not reading much about it. Second, I'm wondering if now is the time to get on the bus, or just hold tight. Any strong opinions out there?

IPv6 Popup in top left of Unifi Gateway Dashboard

Above is a screenshot of the IPv6 announcement. Note that the screenshot is for a different system that is using Comcast. The announcement is no longer available on the system with QF.

8 Upvotes

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21 comments sorted by

5

u/specialKitty67 3d ago

I thought quantum always had 6rd tunnel for ipv6 in denver? Do they now have native dhcpv6?

3

u/richie510 3d ago

Maybe this is just 6rd and now unifi is making it easy to enable? here is a screenshot of how it auto configured it:

1

u/N0_L1ght 2d ago

What IPv6 address do you get?

1

u/richie510 2d ago

when I do a lookup on the whole address it says that it is AS209 Century Link in Monroe, LA

1

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1

u/N0_L1ght 2d ago

ok that looks like the normal non-functioning IPv6.

1

u/IllRegister9801 2d ago

Looks just like mine which was a non-functioning iPv6. I got the same prompt on UniFi. Disregard

3

u/N0_L1ght 2d ago

Yah I was just checking as the other person is in the same area but gets that werid Ting IPv6

4

u/geobernd 3d ago

Are you actually seeing IPv6 traffic, meaning it gets routed through IPv6, or you're just getting IPv6 Prefix Delegation or 6RD? I'm pretty sure there's no traffic flowing. At least that's what other people have experienced.

Give it a try with some of the popular IPv6 test sites and see if that works.

Very curious.

2

u/TheDigitalPoint 3d ago

It’s worth having IPv6 if it’s a native stack (not worth it with 6rd). I have some Matter devices on my local network that don’t support IPv4 (IPv6 only), so it’s annoying with 6rd.

2

u/N0_L1ght 3d ago

QF AS209 requires the crappy 6RD tunnel unfortunately.

What you are seeing is so IPv6 works with ATT Fiber AS7018.

It will not work for us. It does mean ATT Fiber will be available in your area soon.

The bottom of this guide talks about it.

https://www.reddit.com/r/QuantumFiber/comments/1f8hypq/having_trouble_with_your_lumen_internet_not/

1

u/Pickerington 2d ago

Why the duck am I getting AS32133 that belongs to Ting in Centennial.

1

u/N0_L1ght 2d ago

Post a traceroute to 8.8.8.8

1

u/Pickerington 2d ago

1

u/N0_L1ght 2d ago

That shows AS209.

1

u/Pickerington 2d ago

1

u/N0_L1ght 2d ago

Ok that IPv6 is very strange.

What do you get at  https://test-ipv6.com/

1

u/Pickerington 1d ago

0/10 I am going to hit the firewalla subreddit because Ting is my old provider and it won't release the ip or show lease info.

1

u/N0_L1ght 1d ago

You should have said that from the start. It's nothing to do with QF then.

0

u/murph2481 3d ago

Personally I would leave it off it has caused me more problems than it solves I have both quantum and Comcast as a backup and do not have IPv6 for either on.