Skip to main content

    Support

    Offers

U
user_a92g4o
1st Topic

3 Messages

Sunday, April 6th, 2025 7:08 PM

Can I use XD4 with my own wifi router?

If I upgrade from the asymmetric plan to X-500 or X-Gig, I understand that I'll be getting XD4 modem (DOCSIS 4.0) + XB8 gateway.

I recall XD4 has two 10G ports, so in theory I could connect my own router (ASUS or Netgear with some advanced VPN setup), and ignore XB8 completely, maybe even just disconnect XB8, right?

Is there any need in using XB8, if I am not planning to connect via it?

Question

 • 

Updated 

6 days ago

51

2

0

Accepted Solution

kirkyg

Visitor

 • 

18 Messages

6 days ago

I think the following should answer your question.  Im referencing a post by 'dataz03' on Reddit who had details on the XD4 and how the 10gb ports are configured:

The XD4 is a standalone modem that is being used for DOCSIS 4.0 customers as the new XB10 gateway is not available just yet. The XD4 modem features two 10GB ports. An XB8 is connected to one of the ports and operates in Ethernet WAN mode instead of in DOCSIS mode. This provides the customer with a router and wireless access point. The other 10GB ports can be connected to a computer or another router. X-Class tiers are currently set to allow the customer's XD4 modem to pull two WAN (public) IP addresses, so you can use both 10GB ports on the XD4 at the same time. (But on two completely different LAN networks, see above). 

Essentially you have two separate lan networks so you'll want to bridge the modem to your router and use that and ignore the xb8.  Maybe someone at comcast can clear up whether its required that it stays on and connected or not?


Note this is a 5 month old post so the XB10 is starting to become available now I just dont think it has enough volume to keep up with expansion of the x class service yet.

Does that answer your question?

(edited)

2

user_a92g4o

3 Messages

Right, this is essentially what I am trying to figure out: do I need XB8 connected to have XD4 operational, with my own router connected to the second port. XB8 or XB10 alone won't work for me because I  need more advanced router configuration, like VPN server on the router. And I'd rather not have NAT behind NAT, i.e. my router connected through XB8 or XB10, that's insane...

Like

Reply

6 days ago

0

kirkyg

Visitor

 • 

18 Messages

Comcast does not do NAT that I'm aware of as you will get a dynamically assigned IP address for your connection. To your scenario about running your own equipment, you simply put the XB10 (when it becomes available) in bridge mode and it will act as a cable modem only. Then you can have your own router and access points configured like you want. I have this setup now to my personal custom Pfsense router using the XB8 today.

With the xd4 it is already just a cable modem you'll just need to test that it actually gives you dynamic ips to both 10gb ports. Have you tried to sign up for service yet? 

(edited)

Like

Reply

6 days ago

0

XfinityMartyR

Official Employee

 • 

2K Messages

8 days ago

 

user_a92g4o Thank you for reaching out! To receive X-Class speeds, customers must have compatible Xfinity equipment: For X-300: XB8, and for X-500 and above: Advanced Modem (XD4) and XB8. Customer-owned and managed equipment (COAM) is not currently compatible with X-Class speeds.

 

 

2

0

user_a92g4o

3 Messages

@XfinityMartyR​ what I am trying to figure out: do I need XB8 connected to have XD4 operational, with my own router connected to the second port on XD4? XB8 or XB10 alone won't work for me because I  need more advanced router configuration, like VPN server on the router.

Like

Reply

6 days ago

0

XfinityMartyR

Official Employee

 • 

2K Messages

 

user_a92g4o Everything we have on our X-Class Internet points to using only our equipment. It's unknow if bridge mode on the XB8 would be supported. Here's some more information I found, customers on the X-300 tier do not need the XD4 modem, as they will receive the XB8 Gateway. Customers on the X-500 tier and above, the XD4 must be paired with the XB8 Gateway as part of the two-box solution. Therefore, if you are on X-500 or higher, the XB8 is necessary for the XD4 to operate.

 

I am an Official Xfinity Employee.
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

Like

Reply

6 days ago

0

forum icon

New to the Community?

Start Here