Static IP for my router that is connected to my modem xb7 (bridge mode)

I see. I’m at wits end with cable internet. Too much bufferbloat, high jitter, congestion etc… I remember when I had dsl about 12-13 years ago this was never an issue. I really hope fiber becomes available in my area. 

@user_user2718 Thank you for reaching out on the Xfinity Community Forums. Our amazing expert @eg has provided you the best information regarding static IP address and being able to get them through Comcast Business. If you are having service issues we are happy to take a look if you wish. Please let us know if you need anything further. 

Weird Question but if anyone that knows the engineering behind the Xfinity networking can possibly answer this. My question was if my packets are coming from the backbone of Comcast’s network. Does comcast Xfinity automatically mark my packets with a DSCP priority? I’ve read online in many forums that comcast already marks our packets with a priority class right before it enters the customers network. If so, is there any way to avoid that. As I like to manually prioritize my packets with my own level of DSCP marking from my own circuit. Seemingly why I ask this. Well, with some of the traffic I do have in my household, primarily gaming; I would like my gaming traffic to not have a regular class priority but a higher class of priority where it is considered the first to enter the network and the first to exit the network

Hello @user_user2718, thank you for taking the time to reach out on social media.

I'd be happy to check into that for you.

To access your account, will you please send us a direct message with your full name and complete service address to “Xfinity Support”. To do so, click on the chat icon located at the top right of this forums page.

Here's the detailed steps to direct message us:

• Click "Sign In" if necessary

• Click the "Direct Message” icon (upper right corner of this page)

• Click the "New message" (pencil and paper) icon

• Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list

• Type your message in the text area near the bottom of the window

• Press Enter to send your message

Hey I have a question. I run the xb8 modem with my gigabit x2 plan. I was looking over the settings in the modem page and I went to the system software version page. Where it says packet cable it says 2.0 and if I recall I’m on docsis 3.1 so shouldn’t it say 3.1 instead of 2.0. I talked to an Xfinity agent and they also said it should say 3.1 and not 2.0. But I’m not too sure if packet cable correlates to docsis. 

@user_user2718 Hello! Thank you for reaching out to us here on our Community Forum. Did you happen to see the response from our Expert @EG? If you still have any questions, please let us know.

Hey, user_user2718! Thanks for reaching out to us on the forums! Oddly enough this question about CGNAT was just recently asked to us and we were able to find out that Xfinity does not use CGNAT. You can see this information from 2011: ipv6-deployment and ipv6-deployment-technology. Furthermore, CGNAT IPs usually start in 100.x.x.x (thanks for that information @EG!). Does that second IP address always pop up no matter where you trace route to? It certainly is an interesting one.

Yes I always do see it. I just don’t know what it is. It should be a public ip after the first hop which is my private ip but oddly enough my first two hops are private iPs. Which is causing double nat

Are you by chance using a personal router?

Yes I am. I am using a cable modem not a modem router combo. Then I have a router connected to it. 

Also I have another problem. It’s actually been going on with a few of my modems I have tested in the course of 6 months- a year. I keep getting a critical error saying. TIME SYNCHRONIZATION FAILED. Failed to acquire qam/qpsk symbol timing. I checked both down and upstream levels and they all are within spec. About 44-45db. I need to know what can I do to address this issue properly to have it resolved. It is making my internet experience completely unstable.