XB8 gateway issue

@XfinityAmira​  yes I had 4 techs back to back in 4 days to my property they changed my router to a xb8 to xb7 . Also tried a xb6 gateway still getting diag log firewall error FW IPv6 Foward drop, 363 attempts, fire wall blocked . I seriously looking to get a lawyer involved soon since this company can’t come up with a solution considering I have had service issue for 2 weeks now with my gaming console not being able to use the IPV6 port properly on the gateway firmware blocking the traffic . This is just unacceptable at this point . I tried to use my gaming console at several locations that aren’t Comcast and multiplayer functions works fine. 

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@XfinityAmira​ this issue is still ongoing with no fix in sight . It’s definitely an engineering level fix . The Tech did all the can do . Here is some updated proof that xfinity service is causing my IPV6 issue which is why my gaming console can’t get into any multiplayer or Xbox live connection 

I’m writing to request escalation and technical review regarding an ongoing issue with my Xfinity Internet service that prevents Xbox Live multiplayer from functioning.

Despite multiple support attempts, my Xbox continues to fail the “Multiplayer Connection Test” due to a Comcast gateway IPv6 routing failure that has been independently verified using the gateway’s internal diagnostics.

Here are the specific details of my testing:

• Gateway Model: XB8
• Firmware Version:
  Prod_23.2_231009 & Prod_23.2_231009
  Software Image Name:CGM4981COM_8.1p7s1_PROD_sey
  Advanced Services:CGM4981COM
• Internet Tier:  2.0 Gbps]
• Diagnostic Test: IPv6 connection test run from the gateway’s Troubleshooting → Connection → IPv6 Test page
• Results:
  
• • ✅ OpenDNS (2620:0000:0ccd:0000:0000:0000:0000:0002) – Passed
  • ✅ Cloudflare (2606:4700:4700:0000:0000:0000:0000:1111) – Passed
  • ✅ Secondary test address – Passed
  • ❌ Microsoft (2620:01ec:0c11:0000:0000:0000:0000:2001) – Failed
  • ❌ Microsoft (2620:01ec:0c12:0000:0000:0000:0000:2001) – Failed
  • ❌ Microsoft Teredo test address (2001:0000:53aa:064c:0000:00fb:1e5f:0032) – Failed

This confirms that the gateway cannot reach any Microsoft IPv6 network endpoints, while other IPv6 routes remain partially functional.

Because Xbox Live multiplayer relies on Teredo (IPv6 tunneling) to establish game sessions, this routing defect completely prevents multiplayer connections, even though all other Internet services work normally.

I have verified that:

• The Xbox hardware, cabling, and account are functioning correctly on other networks.
• The issue is isolated to Comcast’s IPv6 path on this gateway.
• IPv6 cannot be disabled by the user on XB7/XB8/XB6 devices.

This points to a known IPv6 routing or firmware issue within Comcast’s XB7/XB8 gateways (builds prior to v5.2.2).

Please escalate this case to your Network Engineering or Firmware Team for review and confirm whether an updated firmware build or IPv6 routing fix is available for my region.

I am requesting:

1. Confirmation that this issue is under investigation by Comcast engineering.
2. A timeline or firmware version number for the fix rollout.
3. Billing credit consideration for loss of Xbox Live multiplayer functionality.

Will do Comcast still hasn’t fixed my issue not even a email with any updates. This company is the worst 

Was there any new update on this issue? I just switched from my own modem to an XB8 and have been regretting it. I’ve had issues on both Xbox consoles and my gaming desktop.

Nope Xfinity never found a fix been over 2 months . Still can’t play my Xbox on there [Edited: Language]network. The only thing I haven’t done is buy my own modem . This company is trash wish I could have service from Att . Their customer service is 3rd world country at best !!!! Don’t get there service if you can avoid it 

No I haven’t tried my own router . I’m going to get one soon but you should not disable IPv6 your Xbox multiplayer gaming needs this to communicate to server to connect to multiplayer gaming port . The issue is in Comcast network cloud blocking the IPv6 . If you see my post in the past if you login into your router via 10.0.0.1 and for the diagnostic logs you will see your IPV6 port being blocked by firewall from router . I assume your own router is doing this but since you just like I have tried all there router even there old legacy ones like the xb7 and xb6 I was told from a technician that there cloud firewall is automatically setting protocols to there gateways via a Xfinity cloud service for there gateways and network . Just look at there logs you will see the port being blocked this is why Xbox multiplier isnt working for so many of us. Again Comcast refuses to do anything about it and I have been in talks with a lawyer for a class action lawsuit . Will see if they get off there [Edited: "Language"] and actual do something . Also you must go to advanced setting and reenable the UPNP on the xb8 router . You should be able to temporary play some Xbox live games buts its spoty at best. The UPNP setting on my xb8 automatically and randomly sets it self off and crashes my online gaming for my PC . My Xbox consoles still has issue on Comcast network . I think a Class action law suit might be the best option at this point. Comcast has not even reached out to me since October 14 about my issue being resolved . Worst company I have ever had to deal with  . Hope this helps in anyway and best of luck with this [Edited: "Inflammatory"]