Using Your Own Router With an Xfinity or AT&T Gateway
Internet providers often supply a gateway, a modem and router in one box. If you plug your own router or mesh system into it, you end up with two routers doing the same job, which Apple calls double NAT and says can cause problems (Apple Support: Recommended settings for Wi-Fi routers and access points). The fix is to let your router do the routing and have the gateway just pass the internet connection through. Xfinity calls this Bridge Mode and AT&T calls it IP Passthrough. You still need the gateway as your modem.
Is this the right guide? This guide covers Xfinity and AT&T gateways-specific steps. If every device in your home is losing Wi-Fi, not just this one, start with Why Does My Wi-Fi Keep Disconnecting?.
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Quick answers
- Xfinity: turn on Bridge Mode in the gateway’s Admin Tool at 10.0.0.1, then plug your router into any Ethernet port (Xfinity: Enable or disable Bridge Mode on your Wireless Gateway).
- AT&T: set IP Passthrough at 192.168.1.254, under Firewall, IP Passthrough, then restart your router so it picks up the public address (AT&T: Set up IP Passthrough on your gateway).
- Spectrum: Spectrum says customers may use or buy their own router (Spectrum: Modem vs. router).
- Why bother? Apple recommends that only one device on your network does NAT and only one acts as the DHCP server (Apple Support: Recommended settings for Wi-Fi routers and access points).
- What you give up: on Xfinity, you can’t manage the network or use xFi extenders in the Xfinity app while Bridge Mode is on (Xfinity: Enable or disable Bridge Mode on your Wireless Gateway).
Xfinity versus AT&T at a glance
| Xfinity Bridge Mode | AT&T IP Passthrough | |
|---|---|---|
| Where to set it | http://10.0.0.1, Gateway, At a Glance | http://192.168.1.254, Firewall, IP Passthrough |
| Login | Username admin and the password on the gateway sticker | Device Access Code if prompted |
| Devices that get internet | One device, on any Ethernet port | One device in passthrough |
| Other devices | Gateway routing is off, so everything connects through your router | Other gateway devices may not be able to share files with the passthrough device |
| Watch out for | Not available with Xfinity CyberSecure or active xFi extenders | Removes the gateway’s firewall protection for the passthrough device |
Sources: Xfinity: Enable or disable Bridge Mode on your Wireless Gateway, AT&T: Set up IP Passthrough on your gateway.
Xfinity: turn on Bridge Mode
Before you start, know what changes (Xfinity: Enable or disable Bridge Mode on your Wireless Gateway):
- Bridge Mode turns off the gateway’s routing features. It still works as your modem.
- Only one device can connect, on any of the gateway’s Ethernet ports. That should be your router.
- You can’t manage your network or use WiFi Extenders in the Xfinity app while it’s on.
- It isn’t available with Xfinity CyberSecure, or if Xfinity WiFi Extenders are already activated.
- It doesn’t turn off the Xfinity WiFi Home Hotspot.
- On a device connected to the gateway, go to http://10.0.0.1. You may need to enable Admin Tool access in the Xfinity app first.
- Sign in with the username admin and the password on the gateway sticker.
- Go to Gateway, then At a Glance, and set Bridge Mode to Enable. Click OK on the warning. The gateway may restart.
- Log out, then connect your router to any Ethernet port on the gateway with a cable.
- Set up your router as normal. To undo it, sign back in over Ethernet (you must be wired to turn Bridge Mode off) and set Bridge Mode to Disable.
AT&T: set up IP Passthrough
AT&T describes IP Passthrough as an alternative to bridged mode. It shares the gateway’s public IP address with one device behind it (AT&T: Set up IP Passthrough on your gateway):
- Only one device can be in passthrough.
- That device loses the gateway’s firewall protection, so use a router with its own firewall.
- Because it gets the public address, other devices on the gateway may not be able to share files with it.
- Connect a computer to the gateway with an Ethernet cable and go to http://192.168.1.254.
- Select Firewall, then IP Passthrough. Enter the Device Access Code if asked.
- Set Allocation Mode to Passthrough.
- Pick a Passthrough Mode: DHCPS-fixed lets you choose your router by its MAC address and is the one AT&T recommends when more than one device is wired to the gateway. DHCPS-dynamic gives the address to the first device that asks. Manual needs your address from AT&T.
- Select Save, then Restart Now.
- Power cycle your router. Its internet (WAN) port must be set to get its address automatically (DHCP).
Older 2Wire and Pace gateways call this DMZplus: Settings, Firewall, Applications, Pinholes and DMZ, select your router, choose “Allow all Applications (DMZplus mode)” and Save (AT&T: Set up IP Passthrough on your gateway).
After the switch: tidy up the network
- Avoid two competing Wi-Fi networks. Apple recommends a single network name for all bands (Apple Support: Recommended settings for Wi-Fi routers and access points).
- Only one DHCP server: your router should hand out addresses, not both boxes (Apple Support: Recommended settings for Wi-Fi routers and access points).
- Reconnect smart devices: if your new router uses a new network name or password, every plug, camera and lock needs setting up again. Reusing the old name and password saves work for many devices.
- Keep the gateway: it still provides the internet connection as your modem (Spectrum: Modem vs. router).
Products mentioned in this guide
Details come from TP-Link’s product pages and the Amazon listings. When we checked on October 24, 2026, both were in stock new, sold and shipped by Amazon.com.
TP-Link Archer AX55 (AX3000 Wi-Fi 6 router)
A dual-band Wi-Fi 6 router with gigabit Ethernet, for a small or medium home. Plug its internet port into the gateway after you turn on Bridge Mode or IP Passthrough.
View the TP-Link Archer AX55 on Amazon (affiliate link) →
We have not independently tested this product. Availability, specifications and platform support can change; confirm the details on the product listing and the manufacturer's site.
TP-Link Deco X55 (AX3000 Wi-Fi 6 mesh, 3-pack)
A Wi-Fi 6 mesh system for larger homes, with one network name across bands and three gigabit ports per unit. The main unit connects to the gateway’s Ethernet port. A mesh system replaces your router; it isn’t an add-on extender.
View the TP-Link Deco X55 3-pack on Amazon (affiliate link) →
We have not independently tested this product. Availability, specifications and platform support can change; confirm the details on the product listing and the manufacturer's site.
Frequently asked questions
Can I use my own router with Xfinity?
Yes. Turn on Bridge Mode on the Xfinity gateway and connect your router to one of its Ethernet ports. The gateway keeps working as your modem.
What do I lose with Xfinity Bridge Mode?
The gateway’s routing and Wi-Fi management in the Xfinity app, and you can’t use Xfinity WiFi Extenders. It isn’t available with Xfinity CyberSecure.
Does AT&T fiber have bridge mode?
AT&T uses IP Passthrough instead. It gives the gateway’s public IP address to one device, such as your router.
Which AT&T Passthrough Mode should I use?
AT&T recommends DHCPS-fixed, which targets your router by MAC address, if more than one device is wired to the gateway.
What is double NAT?
Two routers each translating addresses, one behind the other. Apple recommends only one device doing NAT on a network, since double NAT can cause problems.
Can I use my own router with Spectrum?
Spectrum says customers may use or purchase their own router. You still need a modem.
Do I still need the ISP gateway?
Yes. In Bridge Mode or IP Passthrough it still works as your modem, and Spectrum also notes a modem is needed alongside your own router.
Will my smart home devices reconnect on their own?
Only if the new router uses the same network name and password as before. Otherwise set each one up again.