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nsaconsultant

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Where is IPv6 Support for Cox Gigablast Fiber?

Cox, it’s 2025, and I’m here to ask: where is the IPv6 support for your Gigablast Fiber service?

You’ve been promising IPv6 support for years. Your own moderator, Lisa, posted on the forums five years ago:

"Cox has established an IPv6 Migration Program to make sure that all Cox networks, systems, and products have IPv6 compatibility so that when the IPv4 addresses are exhausted, we will continue our business operations without interruption. We are in the process of developing the IPv6 migration plan for all of products and services."

That was half a decade ago. And yet, IPv6 support for Gigablast Fiber remains non-existent. This lack of progress is unacceptable, especially for a service marketed as a top-tier fiber solution.

Many users have been patiently waiting, discussing the need for IPv6 support, and repeatedly questioning its timeline:

We’ve reached a point where IPv4 is no longer sustainable, and IPv6 adoption is essential for modern internet functionality. Major ISPs worldwide have implemented IPv6, yet Cox seems stuck in neutral.

Why is Cox Gigablast Fiber—your premium service—still without IPv6 support? What is the timeline for implementation? Your customers deserve transparency and action, especially for your fiber customers, who are among your most advanced and discerning users.

It’s time to deliver on your promises, Cox. Let’s hear an update.

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WiderMouthOpen

Esteemed Contributor III

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Good question. As per here, it seems it is supported, since it mentions it works with a ONT. However I also found a post where a moderator said that page was incorrect when it said IPv6 was available to all customers and only applied to DOCSIS customers. I also found some posts on Reddit from people saying it worked for them, so maybe it works in some fiber areas but not all? Hopefully a moderator will know but I predict they will just tell you to email them.

Have you actually tested if it works? If so, are you using a Panoramic gateway or your own router? If your own, what settings are you using? Have you tried bypassing your router?

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nsaconsultant

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I have configured IPv6 over cox connections at over 50 sites, it works fine for docsis service over coax, it works fine for business fiber service, it however does not work and has never worked for gigablast fiber for the home at any site I have tried. I have tried IPv6 DHCP requesting /56 /60 /64 prefixes, I have tried using SLAAC to get a subnet, static IP's are not an option with residential service, so at a loss. Many others seem to be facing the same issue.

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WiderMouthOpen

Esteemed Contributor III

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Maybe it's not available in your area, but it seems it's available for fiber in general. I saw your post on Reddit and 2 people from AZ said theirs was working. Are you in AZ? If you want to ask Cox directly, email them via the welcome thread. 

Are you using a retail router or something more complex like pfSense or ddWRT? If you want to rule your side out you could try renting their gateway for a bit and see if it works.  Their gateway has no IPv6 settings to configure so if it's available in your area, it should work on the gateway plug and play.

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nsaconsultant

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I have IPv6 running fine at many other sites, just not one Gigablast fiber home site works (yes, in Phoenix area). Hardware is a mix at the sites: Unifi, Fortinet, SonicWall. All, same issue.

I have spoken to support many times over the years, and they tell you it is not supported for home fiber. Most recently just over a month ago when I had one of my ONT's replaced, I decided to give it another go, same results.

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WiderMouthOpen

Esteemed Contributor III

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It doesn't sound like you don't want to troubleshoot so I suggest again to contact Cox directly. You have gotten input from users but you don't seem to believe it. The best Cox will be able to do is confirm if IPv6 works on fiber in your area. They won't support your hardware. They will probably try to up-sell you to Cox Complete Care. Good luck. Feel free to report here what you find out so it can help others. 

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Darkatt

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What router are you using? Have you verified the router is setup for and properly update/configured for the use of IPv6? I am using a Netgear RAXE300

Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Killer E3100G 2.5 Gigabit Ethernet Controller
   Physical Address. . . . . . . . . : XX-XX-XX-XX-XX
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2600:8805:2700:39:362b:Blanked out-(Preferred)
   Temporary IPv6 Address. . . . . . : 2600:8805:2700:39:Blanked out-(Preferred)
   Link-local IPv6 Address . . . . . : fe80::c654:Blanked out-(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.xxx.xxxx(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Wednesday, January 22, 2025 1:50:28 PM
   Lease Expires . . . . . . . . . . : Friday, January 24, 2025 1:50:28 PM
   Default Gateway . . . . . . . . . : fe80::3698:b5ff:Blanked out-
                                       192.168.1.1
   DHCP Server . . . . . . . . . . . : 192.168.1.1
   DHCPv6 IAID . . . . . . . . . . . : 214734565
   DHCPv6 Client DUID. . . . . . . . : Blanked out-
   DNS Servers . . . . . . . . . . . : 2600:8805:2700:Blanked out-
                                       192.168.1.1

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WiderMouthOpen

Esteemed Contributor III

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Can you post your IPv6 WAN settings as seen at ADVANCED > Advanced Setup > IPv6 as seen here. Edited for privacy of-course.

However, I think OP is using prosumer/enterprise grade hardware, which require extra configuration. I asked what OP was using but they seemed to avoid the question, which I assume has something to do with they are IT of some kind and doesn't want say what hardware the customer is using.

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