Visitor

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Sunday, February 1st, 2026 3:00 PM

Bridge mode setting blank

New user with an XB8. Orbi is downstream, and I want to disable bridge mode on the Xfinity gateway to prevent double NAT.

I've allowed web admin access. I use Mac Safari.

I don't see the toggle to turn bridge mode on or off. It's just blank!

No help with Mac Chrome...same problem.

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Official Employee

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2.3K Messages

2 days ago

Hello, @user_u2lfmo! Thanks for creating a post with this setting concern. You've come to a great place for help! Our team is always more than happy to see what we can do to review and resolve things as quickly as possible. The blank screen issue on our admin portal (10.0.0.1) is a known quirk, usually caused by a firmware sync issue or a specific browser rendering hang-up. Since you've already tried Safari and Chrome, let’s look at the "under the hood" reasons this happens and how to bypass it.

 

1. The "Ghost" Bridge Mode Fixes
Before assuming the hardware is faulty, try these steps in order:

- The Private Window Trick: Even if you tried different browsers, local caching can mess with the gateway's CSS. Open an Incognito (Chrome) or Private (Safari) window and log in. This forces the browser to pull the toggle switch fresh.

- Check the "MoCA" Conflict: Sometimes if MoCA (Multimedia over Coax) is active, the Bridge Mode page hangs. Try navigating to Gateway > Connection > MoCA and disabling it temporarily, then refresh the Bridge Mode page.

- The App Alternative: We have been moving away from local web admin control in favor of the Xfinity App.

Open the app.

Tap Connect.

Select See Network Details.

Look for Advanced Settings. (Note: Bridge Mode isn't always available here for all regions, but it’s worth a 10-second check).

 

2. The Hard Reset (The "Nuclear" Option)
If the page is blank, it often means the XB8 hasn't fully registered its provisioning with our servers.

- Action: Hold the reset button on the back of the XB8 for a full 30-60 seconds.

- Why: This forces a factory reset and, more importantly, a firmware check. Once it reboots, the Bridge Mode toggle often magically reappears.

 

3. Verify the "Double NAT" Workaround
If you absolutely cannot get the Bridge Mode toggle to appear, you can achieve a similar result by:

- Disabling the XB8 Wi-Fi signals manually.

- Setting the Orbi's IP as the DMZ Host in the Xfinity Gateway settings.

This tells our firewall to pass all traffic through to the Orbi, effectively neutralizing the Double NAT issues for gaming or VPNs.

 

Common Gateway Configuration

Feature: Wi-Fi

Gateway Mode (Default): XB8 Broadcasts Wi-Fi

Bridge Mode (Recommended for Orbi): XB8 Wi-Fi is Disabled

 

Feature: Routing

Gateway Mode (Default): XB8 handles IP addresses

Bridge Mode (Recommended for Orbi): Orbi handles all IP addresses

 

Feature: NAT

Gateway Mode (Default): Strict / Double NAT (with Orbi)

Bridge Mode (Recommended for Orbi): Open / Single NAT

 

A quick heads-up: Once you successfully enable Bridge Mode, your Orbi must be plugged into the Port 4 (the one with the orange line) on the XB8 to get the best throughput, especially if you have speeds over 1Gbps. Please let us know if this helps!

Expert

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115.8K Messages

@XfinitySara@user_u2lfmo 

3. Verify the "Double NAT" Workaround
If you absolutely cannot get the Bridge Mode toggle to appear, you can achieve a similar result by:

- Disabling the XB8 Wi-Fi signals manually.

- Setting the Orbi's IP as the DMZ Host in the Xfinity Gateway settings.

This tells our firewall to pass all traffic through to the Orbi, effectively neutralizing the Double NAT issues for gaming or VPNs.

Just for the purposes of additional information;

Using a DMZ (Demilitarized Zone) on an ISP-provided router to point to a second, personal router helps mitigate the negative effects of Double NAT (like gaming/VPN issues) by passing all incoming traffic to the second router. It does not technically eliminate the two layers of Network Address Translation (NAT) but acts as a, convenient workaround, allowing the second router to manage port forwarding. 

Key Aspects of DMZ in Double NAT Scenarios:

  • Purpose: The main goal is to bypass the ISP router's firewall/NAT for all incoming, non-configured traffic, making it ideal for gaming consoles or advanced routers behind a modem combo.
  • How it works: You log into the first (ISP) router, enable the DMZ feature, and enter the WAN/IP address of the second router.
  • Double NAT Reality: Even in a DMZ, both routers are still performing NAT, and the second router still sits on a private subnet behind the first.
  • Better Alternatives: If possible, configuring the ISP device in Bridge Mode or IP Passthrough is superior to a DMZ as it completely eliminates double NAT rather than just bypassing it.
  • Risks: Placing a device in the DMZ exposes it directly to the internet, so it should only be used for a robust firewall or a single gaming device, not a whole network, unless that second router is fully secured. 

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

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Visitor

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1 Message

3 hours ago

I have exactly the same problem.  I see one post where the Xfinity tech team is working on it.  Can they fix me as well?

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