Is Comcast really planning on CG-NATting customers?

Hello all, I am looking for clarification on whether Comcast is intending to start carrier grade NATting customers? Will there be a means of opting out? (If so and if not respectively, then I will most definitely be switching providers......)

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EG

Expert

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111.1K Messages

23 days ago

@train_wreck

Hello again T_W !! I doubt that you'll get any kind of answer on that here.... I reported this to Comcast insiders when I first saw it a year ago. It's also been reported to their network engineering department's higher ups, but so far, nothing but denial and silence.

(edited)

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train_wreck

Contributor

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58 Messages

@EG yeah I pretty much had the feeling this is screaming into the void posting here. I already noticed since signing up a year ago or so that while I still have a global IP on my WAN facing personal router, my first hop is always a 10.0.0.0/8 private IP. I still have inbound connectivity from the internet, but for how long?......

Is Jason Livingood still kicking around the company? If so, then I wonder what his opinion of this might be.....

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23 days ago

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EG

Expert

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111.1K Messages

22 days ago

@train_wreck

Yes he is. Denial and crickets. Can't blame him though, he likely has to tow the company line. It would be nice if he would pop in to these boards now and then. It's been years.

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XfinityMichaelC

Administrator

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4.4K Messages

21 days ago

Hey @train_wreck! I hope you are doing well. I'm trying to get these resolved. I have asked about this in the past and it was mentioned that we shouldn't be CGNat since we are dual-stack. However, this has been popping up more on the Xfinity forums. Could you possibly post a tracert so I have an example?

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train_wreck

Contributor

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58 Messages

Michael, thanks for the response and dedication to looking into this. I don’t personally have a trace that shows this, but according to your other reply here you’ve already collected some. I will say that I’m not sure I follow the logic of CGNAT being not implemented due to dual-stack. Those things can and do exist alongside each other. The cell carriers already do this exact thing; my phone on Verizon has a CGNAT v4 as well as a global v6.

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21 days ago

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EG

Expert

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111.1K Messages

21 days ago

@XfinityMichaelC

Thanks for posting here Michael. I knew that you could be counted on !!

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BruceW

Gold Problem Solver

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26.5K Messages

21 days ago

@XfinityMichaelC wrote: "... Could you possibly post a tracert so I have an example?"

The trace in https://forums.xfinity.com/conversations/your-home-network/6834f66e0cfffc3f9146b198 shows a CGN IP in hop #2.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

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XfinityMichaelC

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4.4K Messages

@BruceW Yup! Already got one thanks to @EG. I need to gather multiple examples as I'm trying to make a case for it.

(edited)

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Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer. tick

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21 days ago

XfinityMichaelC

Administrator

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4.4K Messages

16 days ago

Just wanted to follow up here. I'm currently reaching out to some people to see if I can get an answer or a workaround. Just to set an expectation I may not even get an answer. Just know I'm still working on this and will follow up if I come across any updates.

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train_wreck

Contributor

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58 Messages

@XfinityMichaelC yeah I know the drill, this may or may not be publicly officially released. If you have any influence at all in this process, I would request that having an OPT OUT mechanism would solve any of my misgivings about CG-NAT. 99% of people won't ever bother you at all with opting out, and the other 1% of people who actually know what it is and why they'd want to remove it would be able to do so.

My 2 🪙, and thanks a lot for looking into this.

(edited)

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15 days ago

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EG

Expert

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111.1K Messages

16 days ago

Ok, thank you @XfinityMichaelC !

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Your Home Network

train_wreck

Is Comcast really planning on CG-NATting customers?

EG

train_wreck

EG

XfinityMichaelC

train_wreck

EG

BruceW

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

XfinityMichaelC

XfinityMichaelC

train_wreck

EG

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