Xfinity ipv6

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Add a port forward · Isn't connected to your home network. · Is using an IPv6 address. · Has a static IP set in the Gateway Admin Page.You can effectively disable DHCP over IPv4 by making the lease pool only one IP wide, and make that a reservation for your your PiHole server. But you can't disable IPv6 or set an internal IPv6 DNS server, so devices will still use Comcast even if you use another device for IPv4 DHCP. Best way I was able to work around it was change the DNS ...WiFi security: For encryption, WPA2 and WPA3 are still considered secure at this time. That may change in the future. WPA3 is replacing WPA2, but not all devices can do it currently. WPA3 is recommended. Use WPA3 if your devices can, just to keep on the current security edge. IPV4 and IPV6 are just protocols.Xfinity's IPv6 Support Explained • Xfinity & IPv6 • Learn how Xfinity supports IPv6, the latest Internet Protocol promising endless addresses for a faster and …Jul 5, 2021 ... IPv6 Subnet PD Nightmare With Comcast's Recent Network Upgrade. Hi,. As you may know, Xfinity recently graded it's network speed to 2.5gbs. That ...This week at the North American Network Operators Group’s 46th meeting (NANOG46) Comcast demonstrated end-to-end IPv6 readiness on its network. Comcast is testing and trialing IPv6 by proactively checking the readiness of our software, hardware and systems. In some cases we’re replacing or upgrading equipment to ensure the transition is ...Feb 3, 2023 · For the most part, modems don't care about IPv4/IPv6. It's the router that needs to support it. I used to have a Zoom 5341J, and IPv6 worked on it. Comcast does use IP to access the modem for checking and updates and configuration. That may be v4 or v6, depending on the model, but is not relevant to the end user.

Xfinity's IPv6 Support Explained • Xfinity & IPv6 • Learn how Xfinity supports IPv6, the latest Internet Protocol promising endless addresses for a faster and …As technology continues to advance, the ways in which we interact with the world around us are changing. Xfinity is a revolutionary new service that is designed to make life easier...24 Messages. Saturday, March 6th, 2021 9:37 PM. Closed. How to setup IPv6 without Comcast DHCPv6 prefix delegation. With the troubles I've had with IPv6 with this week's … Configure Settings. Follow these steps to configure Windows 10 network settings on your computer. Right-click on Start. Select the Network Connections option. Double-click on the network connection you are using. Click Properties (you must be logged in as Administrator, or you will be prompted to log in). Click the Networking tab. Our team can most definitely take a further look at this issue. To send a "Peer to peer" ("Private") message: Click "Sign In" if necessary. • Click the "Peer to peer chat" icon. • Click the "New message" (pencil and paper) icon. • Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears.I have a similar problem. We're using a Peplink Balance router, a dual-WAN router that NAT-balances the office traffic between Comcast and AT&T (for IPv4 only).It also bridges IPv6 to the Comcast modem. The Balance router is also a proxy DNS server, and one if its functions is to substitute lookups for local hosts on the LAN to their local … Configure Settings. Follow these steps to configure Windows 10 network settings on your computer. Right-click on Start. Select the Network Connections option. Double-click on the network connection you are using. Click Properties (you must be logged in as Administrator, or you will be prompted to log in). Click the Networking tab.

Configure Settings. Follow these steps to configure Windows 10 network settings on your computer. Right-click on Start. Select the Network Connections option. Double-click on the network connection you are using. Click Properties (you must be logged in as Administrator, or you will be prompted to log in). Click the Networking tab. Sep 13, 2020 ... It has options to enable DHCP for IPv6 or provide static info. DHCP for IPv6 is enabled and the router has an address, delegated prefix and ...I am afraid that I must disagree. I set this up - had it working and getting a 10/10 from the COMCAST IPv6 test page and 19/20 from here: IPv6 test - IPv6/4 connectivity and speed test (ipv6-test.com) I would test it every day for more than a week. Then one day I ran the tests again. I got 4/10 from COMCAST page and 13/20 from the other.Feb 5, 2014 · Comcast’s Speedtest Now Breaks Out IPv6 Speed Vs IPv4 Speed. UPDATE: 18 March 2021 – Back in 2014 when I wrote this post, it outlined an excellent new tool Comcast had released to compare the speed of your connection over IPv4 versus over IPv6. At the time they were rolling out IPv6 into their networks and were also active with a range of ... Gmail, YouTube, Instagram, and Wikipedia all support IPv6, but a lot of sites don't. Like chase.com (Chase Bank) does not, for example. Its possible to misconfigure a computer so that IPv4 doesn't work but IPv6 does. Comcast supports IPv6, and if the site also supports IPv6 the site will work even if IPv4 is broken.The Comcast IPv6 DNS servers will be prepended regardless of any other setting, static or dynamic. Additionally, all IPv6 DNS lookups are "intercepted" by Comcast and redirected to their IPv6 DNS servers. IPv6 cannot be disabled overall - even if devices have their IPv6 "turned off", the router will forward v4 to v6 and insert itself in the mix

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Today, Comcast’s Xfinity Internet native IPv6 deployment has grown to become the world’s largest IPv6 deployment, as measured by the Internet Society’s World IPv6 Launch Measurements. The Internet Society (ISOC) measures deployment using several data sources, including data from Google, Facebook, Yahoo, and Akamai. Gmail, YouTube, Instagram, and Wikipedia all support IPv6, but a lot of sites don't. Like chase.com (Chase Bank) does not, for example. Its possible to misconfigure a computer so that IPv4 doesn't work but IPv6 does. Comcast supports IPv6, and if the site also supports IPv6 the site will work even if IPv4 is broken.May 12, 2022 · No longer getting IPv6 address after Xfinity work in my neighborhood. I had a well working setup with IPv4 and IPv6. But there was some big work in my neighborhood today (got email about service interruption and saw several crews working on the street), and now that the work is completed, I now longer get an IPv6 address assigned. If 60 doesn't work, try 56, and then try 64. You can use the default ipv6 DNS servers Comcast provides, but I have mine set to the OpenDNS servers. The last screenshot is just showing all the default rules the USG set up for IPv6 interfaces. I didn't set anything up there and hopefully you don't have to either.Comcast Reaches 10G Technical Milestone Delivering 1.25 Gig Symmetrical Speeds Over a Live, All-Digital HFC Network Oct 08, 2020 ... World IPv6 Launch Four Years Later: Taking Stock and Looking Forward Jun 08, 2016 Technology Visualizing the Internet at the RIPE Atlas Hackathon May 19, 2016

With the increasing prevalence of cybercrime, it is essential to take steps to protect your online accounts. Comcast email is one of the more popular email services, and it is impo...May 28, 2023 · Check the Provide DNS configuration via radvd. Under Firewall-->Rules -->Lan. Add an IPv6 Lan Net entry to allow IPv6 traffic on your lan, just look at the IPv4 rule for a guide. Make sure you saved everything while doing this and reboot (again). When it comes back up, you should have IPv6 on the WAN interface. Jul 8, 2013 · If you are a Comcast customer, you simply need to go to www.comcast6.net where you will see at the top of the page the current status in your region. Here is a screen shot from one of our team members who is a Comcast customer: As shown in Comcast’s blog post, if both your regional “ CMTS ” and your cable modem support IPv6 you will see ... IPv6 Configuration Type: DHCP6 Prefix Delegation size: 56 (I found somewhere this was the size supported by Spectrum) Send IPv6 prefix hint: checked Set the LAN interface to track WAN Once it was working, I very quickly discovered that I …I'm reaching out for some advice on setting up IPv6 with my Comcast Xfinity router. I've noticed that we're assigned a /56 IPv6 prefix in the Xfinity settings. However, Xfinity seems to restrict us to a /64 prefix for DHCPv6 or SLAAC. Our goal is to utilize our own DHCPv6 server and distribute the full /56 block into multiple /64 subnets.Test Your Readiness for World IPv6 Day. IPv6 continues to receive an increasing amount of visibility around the world, in part related to an upcoming industry event called World IPv6 Day, which starts in the evening of June 7th in the U.S. While we continue to have a great deal of success with our IPv6 trials, the industry is concerned …Xfinity Home IPV6. I have xfinity with a CM2000 cable modem connected to my pfsense. I get a ipv6 address on wan 2001:XXXXXXXX. I get an ipv6 address on Lan 2601:XXXXXX. I cannot get an ipv6 address on opt1. Wan Settings: Dhcp v6 Prefix Delegation size : 60. Send IPv6 prefix hint. Dont not wait for RA.When it comes to customer service, Comcast is one of the most reliable providers in the industry. With their 24/7 customer assistance, you can get help with any issue you may have ...To halt unauthorized IPv6 traffic in your network, you also need to halt unauthorized IPv6 tunnels hiding in IPv4 traffic. There are many forms of tunnels you might want to control including Teredo, ISATAP, 6to4, 6in4, 6over4. Even GRE 6in4 tunnels might be a concern. In fact, every IPv4 network should also control IPv4 traffic tunneling in ...Enabling IPv6 on owned equipment. I have the Orbi 970 (BE 33000/BE 95) and looking to enable IPv6. What I'm not clear on, and netgear asked me to confirm with …

Assign an IPv6 address to your WAN interface that's in the same /64 that it was in previously when using DHCPv6 or SLAAC/autoconf before. For your LAN interface, assign it a /64 that falls under your allocated /56. If you have more than one LAN interface, repeat using distinct prefixes that fall under your /56.

An IPv6 /56 prefix allows 128-56 bits for the subnet but is usually subdivided into /64 subnets, allowing 128- (56+64) bits to represent a /64 subnet, or 2 to the power of 8 subnets which is 256 /64 subnets. Because IPv4 address are in short supply (most comcast customers get exactly one address) an IPv4 NAT (Network Address Translator) is used.IPV6 - Prefix Delegation Size. Hello, I'm setting up IPV6 for my home network and by default, Comcast is assigning a 64-bit prefix delegation size, which allows only 1 subnet. I have multiple subnets at home and I want to add support for IPV6. According to the last post to this thread, it stated that Comcast no longer accepts hint for /60 prefixes.The Comcast IPv6 DNS servers will be prepended regardless of any other setting, static or dynamic. Additionally, all IPv6 DNS lookups are "intercepted" by Comcast and redirected to their IPv6 DNS servers. IPv6 cannot be disabled overall - even if devices have their IPv6 "turned off", the router will forward v4 to v6 and insert itself in the mix.After some googling, people mentioned it might be due to Google Home Minis using IPv4 for some aspects of functionality. I thought I'd try to disable it on my Netgear …Comcast Reaches 10G Technical Milestone Delivering 1.25 Gig Symmetrical Speeds Over a Live, All-Digital HFC Network Oct 08, 2020 ... World IPv6 Launch Four Years Later: Taking Stock and Looking Forward Jun 08, 2016 Technology Visualizing the Internet at the RIPE Atlas Hackathon May 19, 2016Port 0 is a reserved port, which means it should not be used by applications. Network abuse has prompted the need to block this port. IPv4/IPv6. 25, TCP, SMTP ...Note: If you have an XB7 Wireless Gateway, you’ll only see options for Typical Security and Customer Security after selecting IPv6. Select the firewall setting you want. Click Save Settings. Note: A firewall can be set up on both your computer and your Xfinity Gateway, but more than one firewall can cause interference. Additional information Comcast's IPv6 actually works really well, a lot of providers do not implement it as nicely as they do. A few IPv6 tips though as a first-timer: Make sure you have proper firewall rules in place on your router, because with IPv6 each computer\device on your network will have a globally routable IP address (which they currently don't). Comcast Reaches 10G Technical Milestone Delivering 1.25 Gig Symmetrical Speeds Over a Live, All-Digital HFC Network Oct 08, 2020 ... World IPv6 Launch Four Years Later: Taking Stock and Looking Forward Jun 08, 2016 Technology Visualizing the Internet at the RIPE Atlas Hackathon May 19, 2016

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Yes. If the settings are present and configurable, use DHCPv6 with PD (Prefix Delegation) and RA (Router Advertisement. You may need to also allow ICMPv6. Good luck ! I am not a Comcast Employee. I am a Customer Expert volunteering my time to help other customers here in the Forums.t. e. Internet Protocol version 6 ( IPv6) is the most recent version of the Internet Protocol (IP), the communications protocol that provides an identification and location system for computers on networks and routes traffic across the Internet. IPv6 was developed by the Internet Engineering Task Force (IETF) to deal with the long-anticipated ...Firmware version after the Comcast update is V2.01.02 and I'm including the event log and connection status below. The CM1100 is plugged into our firewall (Untangle v14.1.1) with IPv6 config set to Auto (SLAAC/RA). It's pulling a class A IPv4 address (73.x.x.x/23) without issue, but IPv6 is completely blank.@XfinityJosephA I've gone this route and Comcast could not resolve it. They finally agreed that the issue is that IPv6 cannot be turned off of the router and that "hopefully an update in the future" will fix things. That was over a year ago. I even joined all the comcast xfinity subreddits on reddit.com and made them aware of the issue.Test your connection fast with Xfinity's internet speed test tool and get tips on how to improve your internet performance.Thu Jan 1 00:00:43 1970. Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC= [Edited: "Personal …May 28, 2023 · Check the Provide DNS configuration via radvd. Under Firewall-->Rules -->Lan. Add an IPv6 Lan Net entry to allow IPv6 traffic on your lan, just look at the IPv4 rule for a guide. Make sure you saved everything while doing this and reboot (again). When it comes back up, you should have IPv6 on the WAN interface. IPv6 support in Florida. Does xfinity support IPv6 in zipcode 34287 ? I'm using a Hitron CODA56 (a model that is recommended in the Comcast compatibility list), and an ASUS RT-AX86U router. I've enabled IPv6 in the passthrough mode as instructed by ASUS but the IPv6 test sites show I do not have an IPV6 connection.Xfinity internet is one of the more popular broadband internet providers across the country. With speeds of up to 2,000 Mbps or more, depending on your location, you can enjoy grea...Apr 12, 2012 · In a somewhat controversial move, Comcast is giving each of its home networking users what’s called a /64 block of IPv6 addresses, which represents more than 18 quintillion IPv6 addresses or ... ….

IPv6 is certainly supported on Comcast/Xfinity on the UDM. I have a score of 19/20 on IPv6 test. Configure as below and then reboot the UDM. You should have a 128/ under 2001: and your LAN should have a /64 under 2601:. Instead, because of the recommendation that IPv6 subnets not be divided smaller than /64 (which would break SLAAC, possibly among other things), you need a bigger-than-/64 prefix in order to correctly segment your IPv6 network into multiple subnets.For IPv6, no custom configuration is required on the Business IP Gateway since the provisioning of the IPv6 prefix is managed by Comcast. You would need to subscribe to a block of IPV4 static IP addresses to get the IPV6 static IP's. PTR records can be requested by calling into our care teams through 1-800-391-3000, or you can always …I figured out how to make ipv6 work with the Xfinity modem in bridge mode (or with any third party modem I guess too). The MAC address of the WAN Ethernet adapter that my router has (and that connects to the cable modem's ethernet) starts with 00:07:43 which is a prefix assigned to Chelsio and used for their adapters.Assign an IPv6 address to your WAN interface that's in the same /64 that it was in previously when using DHCPv6 or SLAAC/autoconf before. For your LAN interface, assign it a /64 that falls under your allocated /56. If you have more than one LAN interface, repeat using distinct prefixes that fall under your /56.WiFi security: For encryption, WPA2 and WPA3 are still considered secure at this time. That may change in the future. WPA3 is replacing WPA2, but not all devices can do it currently. WPA3 is recommended. Use WPA3 if your devices can, just to keep on the current security edge. IPV4 and IPV6 are just protocols.Provide IPv6 to your LAN including the clients behind it. For step 1 start with selecting the appropriate IPv6 mode, reconfigure the WAN interface and try to ping an IPv6 address or host from the firewall itself, e.g.: Test if ping over IPv6 to Internet is successful (also possible via Interfaces‣Diagnostics‣Ping ).How to Configure IPv6 in Your Home Network with ISP such as Comcast Xfinity. Dustin Casto. August 17, 2019. (Updated: May 16, 2022) Routers. OPNsense , IPv6. Photo by geralt from Pixabay. Fully Plug 'n Play KVM IP - Control any computer remotely, from BIOS to the desktop with the TinyPilot IP KVM. Starting at $399 · Learn more. Table of Contents.Change Router priority to High. Save and Apply Settings. At this point, you should see IPv6 address show up for each interface configured on the Status > Dashboard. You may need to reboot the router and/or modem as well. Additionally, connected devices should receive IPv6 addresses. Comcast, IPv6, pfSense. ← desktop audio → random snippets. Xfinity ipv6, With a /64 PD from Comcast Xfinity, everything worked automatically when I had no VLANs. Once I introduced VLANs, I could not get IPv6 working automatically. My understanding is that each subnet likes to be /64 size for auto configuration, and if your ISP only gives you a PD of /64 that leaves you with just 1 /64 subnet to work with., Thu Jan 1 00:00:43 1970. Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC= [Edited: "Personal …, If you’re a Comcast email user and suddenly find yourself unable to access your account or experience any other issues, you’re not alone. Comcast email issues can be frustrating, b..., Under Gateway, click Firewall. From there, you can choose IPv4 or IPv6. After choosing either, you will see the following options: Maximum Security (High), which will block most …, Today, Comcast’s Xfinity Internet native IPv6 deployment has grown to become the world’s largest IPv6 deployment, as measured by the Internet Society’s World IPv6 Launch Measurements. The Internet Society (ISOC) measures deployment using several data sources, including data from Google, Facebook, Yahoo, and Akamai. , On said connection, Xfinity is advertising IPv6 ULA routes as evidenced in the output below (mac address filtered to protect the innocent. Note that ens9 is the interface on my router facing Xfinity): $ sudo tcpdump -i ens9 -v multicast and not broadcast. dropped privs to tcpdump. tcpdump: listening on ens9, link-type EN10MB (Ethernet), capture ..., If you did, please remove the that, and the Xfinity app will use an IP address to establish the port forward. If you are using your own modem, check with the manufacturer of your modem on how to disable Ipv6 and set Ipv4 as "Preferred." You can learn more about port forwarding at https://comca.st/3t5QYpr., Want to make your internet-browsing experience smoother and faster? If so, take a look at these tips for maximizing your Xfinity internet experience! By following these tips, you c..., RV340 and Comcast Xfinity IPv6 Config. 01-03-2021 12:03 PM. I am using Comcast's residential service with an RV340 and a NETGEAR Nighthawk Cable Modem with Voice CM1150V. I have configured IPv6 to be enabled. I seem to be able to get a DHCP IPv6 address at the router (WAN port 1 reports an IPv6 address up in WAN1 config)., 2nd - check that your router received an IPv4 address from Comcast. If it did not, make sure you have enabled dhcp client on the router. 3rd - check that your router has a pool of NAT addresses (192.168.0.0/24 for most people though 10.0.0.0/24 works as well) available and that dhcp server is enabled., Visit our Online Support Center to find common solutions and self-help options, troubleshoot or manage your account and more. The easiest way to manage and troubleshoot your Xfinity experience is with the Xfinity app! Download it for free from Google Play or the App Store, or text "APP" to 266278. Have a quick question? Ask Xfinity Assistant., Change Router priority to High. Save and Apply Settings. At this point, you should see IPv6 address show up for each interface configured on the Status > Dashboard. You may need to reboot the router and/or modem as well. Additionally, connected devices should receive IPv6 addresses. Comcast, IPv6, pfSense. ← desktop audio → random snippets., Comcast Tech Support told me my Comcast Approved personally owned Arris SBV3203 router was malfunctioning, and I needed to buy a replacement. But when I talked to my router manufacturer, they suggested I try switching from IPv6 to IPv4., Dec 24, 2017 ... The Solution: · Plug an IPv6 capable computer (must be turned on in your network settings) straight into your cable modem. · Open PowerShell and ..., 6rd. comcast. home. ipv6. router. This is an example configuration for connecting to the Comcast 6RD trial tunnels from a typical residential NAT/DHCP home router. NOTE: Comcast has listed an end date of 6/30/2011 for their 6RD trial. The 6RD gateway may not be accessible after that., Go to Interfaces > LAN. 6. Select Track Interface in the IPv6 Configuration type. 7. Select the Track Interface (WAN) and leave the Prefix ID set at 0. 8. Save and Apply the Changes. 9. Go to Firewall > Rules and create a new rule by clicking the + button to make a rule for the WAN interface., Today, over 25% (and growing) of Comcast’s Xfinity Internet customers are actively provisioned with native dual stack broadband Internet service. Native IPv6 …, 2nd - check that your router received an IPv4 address from Comcast. If it did not, make sure you have enabled dhcp client on the router. 3rd - check that your router has a pool of NAT addresses (192.168.0.0/24 for most people though 10.0.0.0/24 works as well) available and that dhcp server is enabled., WiFi security: For encryption, WPA2 and WPA3 are still considered secure at this time. That may change in the future. WPA3 is replacing WPA2, but not all devices can do it currently. WPA3 is recommended. Use WPA3 if your devices can, just to keep on the current security edge. IPV4 and IPV6 are just protocols., I cannot find the settings on the router using the local web interface, using the Xfinity app, or the Xfinity website. I dont have time to explain why I need to do this as this is not a debate on why I should use IPv6 or how to get around the many issues I have because of it, I just simply would like to know how to disable IPv6 as a Xfi customer., For IPv6, no custom configuration is required on the Business IP Gateway since the provisioning of the IPv6 prefix is managed by Comcast. You would need to subscribe to a block of IPV4 static IP addresses to get the IPV6 static IP's. PTR records can be requested by calling into our care teams through 1-800-391-3000, or you can always reach out ..., We have now started our pilot market deployment of IPv6, which is the first of several phases for our IPv6 deployment. This first phase will support certain types of directly connected CPE, where a computer is connected directly to a cable modem. This will depend upon the cable modem (a subset of DOCSIS 3.0 cable modems, which will expand over …, On said connection, Xfinity is advertising IPv6 ULA routes as evidenced in the output below (mac address filtered to protect the innocent. Note that ens9 is the interface on my router facing Xfinity): $ sudo tcpdump -i ens9 -v multicast and not broadcast. dropped privs to tcpdump. tcpdump: listening on ens9, link-type EN10MB (Ethernet), …, Click "Sign In" if necessary. • Click the "Peer to peer chat" icon. • Click the "New message" (pencil and paper) icon. • Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. The "Xfinity Support" graphic replaces the "To:" line. • Type your message in the text area near the bottom ..., Check Prefix Delegation. id-assoc pd ID: 0 (or whatever number you put after id-pd in Send Options above) Prefix IPv6-Prefix: xxxx:xxxx:xxxx:1a0::/59 (that is, the specific /59 prefix you want) Preferred Lifetime: infinity. Valid Time: leave blank. In the Prefix Interface section., IPv6. Primary DNS: 2001:558:feed::1. Secondary DNS: 2001:558:feed::2. Xfinity is the trade name of Comcast Cable Communications, LLC, a subsidiary of Comcast Corporation, used to market consumer cable television, internet, telephone, and wireless services provided by the company. Xfinity brand was first introduced in 2010; prior to that, all ..., 1. go to your xfinity app and do the following: wifi > wifi details > edit wifi settings > security mode: WPA3 - Personal Transition (NOT PERSONAL ONLY). This is …, Overview of Xfinity Gateways. Xfinity Gateways and xFi Gateways are all-in-one devices that deliver internet and voice connectivity, whole-home WiFi coverage, network security, control and speed for the ultimate connected experience. General features of our latest devices, the xFi Advanced Gateways, include: Secure wireless home network with ..., Welcome to the Xfinity community! Our community is your official source on Reddit for help with Xfinity services. ... I'm trying to find information on how to setup ipv6 on my router, I have a router with a current build of DD-WRT firmware. my questions: (Native ipv6 from isp) or (DHCPv6 with delegation) and after that the other details ..., IPv6 may be disabled to resolve problems associated with: Name resolution – most routers are still configured to use IPv4, so IPv4 requests must be translated to IPv6 ISP does not support IPv6– even major ISPs like AT&T, Xfinity, Verizon, and Spectrum are still working on adding better support and infrastructure for IPv6. If you use a small ..., I think my router just doesn't support ipv6 so there is not much I can do besides getting xfinity to give me an ipv4 address or getting a new router. Edit: Sorry EG for my initial response. I got frustrated hearing Comcast's automated robot telling me to power cycle my devices a million times that I didn't read your instructions carefully., This week at the North American Network Operators Group’s 46th meeting (NANOG46) Comcast demonstrated end-to-end IPv6 readiness on its network. Comcast is testing and trialing IPv6 by proactively checking the readiness of our software, hardware and systems. In some cases we’re replacing or upgrading equipment to ensure the transition is ..., Sep 24, 2019 · The Comcast IPv6 DNS servers will be prepended regardless of any other setting, static or dynamic. Additionally, all IPv6 DNS lookups are "intercepted" by Comcast and redirected to their IPv6 DNS servers. IPv6 cannot be disabled overall - even if devices have their IPv6 "turned off", the router will forward v4 to v6 and insert itself in the mix.