AT&T provides internet through their BGW210-700 (DSL/older fiber) and BGW320-500 (newer fiber) gateways. These are all-in-one modem/router units. Here's how to fix every common issue.
AT&T Gateway Light Guide
| Light | State | Meaning |
|---|---|---|
| Broadband | Solid Green | Internet connected |
| Broadband | Flashing Green | Trying to connect — wait |
| Broadband | Red | No internet — line or account issue |
| Service | Solid Green | Services active |
| WiFi | Solid Green | WiFi enabled and broadcasting |
| Power | Solid Green | Gateway powered on |
Fix 1: Check for AT&T Outage
- Open Smart Home Manager app (on mobile data)
- Check for outage notifications
- Or visit att.com/outages
- Or check downdetector.com/status/att
Fix 2: Restart the Gateway
- Unplug the gateway power cord
- Wait 30-60 seconds
- Plug back in
- Wait 10 minutes for all lights to turn solid green
- For AT&T Fiber: Also restart the ONT (white box on wall) — unplug it for 30 seconds too
Fix 3: Check ONT (Fiber Customers)
If you have AT&T Fiber, check the ONT (Optical Network Terminal):
- Located on an outside wall or in the garage
- Should have a solid green PON light
- If PON light is off or red → fiber line issue (call AT&T)
- Check the Ethernet cable from ONT to gateway
- Power: If ONT has a battery backup, check if battery is dead
Fix 4: Check DSL Filters (DSL Customers)
If you have AT&T DSL (not fiber):
- Every phone jack with a phone plugged in needs a DSL filter
- The gateway jack should NOT have a filter
- Missing filters cause line noise that kills internet speed
- Replace old/damaged filters
Fix 5: Access Gateway Admin Panel
- Open browser → go to 192.168.1.254
- Login with Device Access Code (on gateway label)
- Go to Broadband → Status
- Check if broadband connection type is correct (PPPoE for DSL, DHCP for Fiber)
- For DSL: verify PPPoE username/password are entered
Fix 6: IP Passthrough / Bridge Mode
If you use your own router with AT&T's gateway:
- AT&T gateways support IP Passthrough (similar to bridge mode)
- Go to 192.168.1.254 → Firewall → IP Passthrough
- Set to DHCPS-fixed and select your router
- This gives your router the public IP while keeping the gateway functioning
Fix 7: Factory Reset
- Find the red reset hole on the gateway
- Hold with paperclip for 15 seconds
- Wait 10-15 minutes for reactivation
- For DSL users: You'll need to re-enter PPPoE credentials
- WiFi name/password will reset to the values on the gateway label
Frequently Asked Questions
Why is my AT&T router not working?
Common causes: (1) AT&T outage in your area, (2) Gateway needs restart, (3) Broadband light is red (no sync), (4) Fiber ONT issue, (5) PPPoE credentials lost after reset, (6) DSL line quality degradation, (7) Account issue. The Smart Home Manager app can help diagnose.
What do the lights on my AT&T gateway mean?
BGW210/BGW320 gateways: Broadband solid green = connected. Broadband flashing green = trying to connect. Broadband red = no internet. Service solid green = working. WiFi solid green = enabled. Power solid green = on. If Broadband is red, restart the gateway and check fiber/DSL line.
How do I restart my AT&T gateway?
Method 1: Unplug power → wait 30 seconds → replug → wait 10 minutes. Method 2: Smart Home Manager app → Network → Gateway → Restart. Method 3: Press the small reset button briefly (NOT the red reset hole — that's factory reset). Wait for all lights to turn solid green.
AT&T Fiber vs DSL — does troubleshooting differ?
Slightly: AT&T Fiber uses an ONT (Optical Network Terminal — usually a white box on the wall). If fiber internet is down, check ONT lights and power too. DSL uses the phone line — check for DSL filters on ALL phone jacks. But gateway troubleshooting is the same for both.
How do I contact AT&T for internet issues?
Call 1-800-288-2020, use Smart Home Manager app → Support, visit att.com/support, or chat online. The app can run diagnostics and restart equipment remotely. For persistent issues, schedule a technician visit.
AT&T Still Not Working?
Our technicians can diagnose AT&T gateway and fiber issues remotely.