Network troubleshooting technician providing live chat help

Joe B.

Reviewed for technical accuracy

Specialities: Home networking, Wi-Fi routers, modems, Windows/macOS internet issues, DNS & IP configuration, ISP setup

Fix “modem connected but router has no internet” — modem online, router no WAN IP, Wi-Fi no internet

Technician avatar Technician
Hi! We’ll sort out this modem connected but router has no internet situation so all your devices can get back online. I just need a clear picture of your setup.

• When you plug a computer directly into the modem, does the internet work there?
• When the modem goes into the router, do your phones and laptops see the Wi-Fi name but show “connected, no internet” or “no network access”?
• Do you have a separate modem + Wi-Fi router, or a combined modem/router from your ISP with a second router chained off it?
• On the front of the modem, which lights are on (Power, Online/Internet, Up/Down arrows)? And on the router, what do the Internet/WAN and Wi-Fi lights look like — solid, blinking, amber/red, or completely off?

The more detail we have about the modem lights vs. router lights, the faster we can narrow down why the modem is online but the router has no internet access.
Customer
The modem definitely has internet. If I plug my desktop straight into it, everything works. Once I put the modem back into our TP-Link router, the router’s Wi-Fi comes up, but all devices say “connected, no internet”. On the modem, Power, Downstream, Upstream, and Online lights are solid. On the router, Power and Wi-Fi are on, but the Internet/WAN light is orange and sometimes goes off completely. That’s when the whole house loses internet even though the modem stays connected.
Technician avatar Technician
Perfect, that tells us a lot. If the modem is online but the router has no internet, the problem lives between those two boxes — not with your phones or your ISP line.

Typical causes when a modem is connected but the router won’t get internet:
• The Ethernet from modem isn’t in the router’s WAN/Internet port or the cable/port is bad, so the router never links up.
• The router isn’t getting a valid WAN IP address from the modem/ISP (it shows 0.0.0.0 or WAN “disconnected”).
• Your ISP needs a specific connection type (PPPoE, static IP, VLAN tag) and the router is left on plain DHCP.
• A previous router or PC is still “remembered” by the modem (MAC binding), so the new router is being refused.
• Less common: a buggy firmware update on the router or a misconfigured LAN/DHCP range causing IP conflicts.

We’ll start by confirming the modem → router physical link, then log in to the router and look at its Internet/WAN status so we can see if it’s actually talking to the modem or stuck with no WAN IP.
Customer
The modem’s Ethernet cable is going from its single LAN port into the blue Internet/WAN port on the router, so that seems right. I tried another cable too. When I log into the router page, under Internet it says “Disconnected” and the WAN IP shows 0.0.0.0. As soon as I unplug the router and plug the modem straight into a PC, the PC grabs an IP and the internet works fine. So modem connected, router no internet pretty much sums it up.
Technician avatar Technician
Great description. Many cable and DSL modems “lock” onto the first device they see, so when you swap from PC → router, the modem stays connected but refuses to hand an IP to the new router.

Step A — Clean power cycle so the modem forgets the old device
1) Turn the router off (unplug its power).
2) Unplug the modem’s power as well. If it has a backup battery, pop that out for a moment too.
3) Make sure the Ethernet from the modem is firmly in the router’s WAN/Internet port (not LAN1–4).
4) Wait a full 60–90 seconds so the modem drops the old MAC address.
5) Plug the modem back in first and wait until its Online/Internet light is solid again.
6) Now power on the router and give it 2–3 minutes to boot.
7) Log back into the router admin page and check the Internet/WAN status — does it now show a proper IP, or is WAN IP still 0.0.0.0?

If you still see no WAN IP after this reset, we’ll treat it as “modem connected but router can’t get an IP from modem” and adjust ISP login, MAC clone, or LAN settings.
Customer
I followed that exactly: modem off, router off, modem on first, then router. After it all came back up, I checked the status page. It still shows WAN IP 0.0.0.0 and Internet “Disconnected”. Connection type is set to “Dynamic IP / DHCP”. Our ISP is PPPoE fiber and the tech mentioned something about bridging the modem so the router would do the login, but I never changed anything after that visit.
Technician avatar Technician
That explains it. If the fiber modem (ONT) is in bridge mode, it just passes the line through. Your router must perform the PPPoE login. Leaving it on DHCP will absolutely give you modem connected but router has no internet and WAN IP 0.0.0.0.

Step B — Make the router actually log in (PPPoE)
• In the router’s Internet/WAN section, change the connection type from Dynamic IP / DHCP to PPPoE (or the exact type your ISP lists).
• Enter the PPPoE username and password from the ISP welcome sheet — these are not your Wi-Fi credentials.
• If your ISP bound service to the computer that originally worked, open the MAC Clone section and clone that computer’s MAC to the router’s WAN MAC.
• Save/apply and wait 30–60 seconds. Refresh the status page — the WAN IP address should now show a public IP and Internet should say “Connected”.

When the modem is bridged correctly and the router has a real WAN IP, Wi-Fi and wired devices should stop reporting “no internet from router”. If the router later shows Connected but your devices still say “Wi-Fi connected, no internet”, that’s usually a DNS or DHCP issue on the router or on each device, which we’ll fix next.
Customer
After switching to PPPoE and putting in the username/password, the router now shows Internet: Connected and has a proper WAN IP. However, my Windows laptop still shows “No internet, secured” on the Wi-Fi. Our phones sometimes work, sometimes don’t. So the modem and router both say they’re connected, but some devices still complain there’s no internet.
Technician avatar Technician
Good — that means we’ve cleared the modem → router hurdle. Now we just need your devices to pull clean settings from the router.

Step C — Fix “Wi-Fi connected but no internet” on devices
1) On the Windows laptop, open the Wi-Fi adapter properties and set both IPv4 address and DNS to “Obtain automatically”. Old static DNS entries often cause this “no internet” status even when the router is online.
2) Open Command Prompt as admin and run:
  • ipconfig /release
  • ipconfig /renew
  • ipconfig /flushdns
3) Forget and reconnect to your router’s Wi-Fi network on each phone/tablet. This forces them to grab fresh IP and DNS from the router’s DHCP server.
4) In the router admin, make sure the LAN IP and DHCP pool are in the same subnet (for example, router 192.168.1.1 with DHCP 192.168.1.100–192.168.1.249) and that DHCP is enabled.

After that, check whether at least one device browses the web reliably through the router. If every device still shows modem connected but router has no internet, we’ll tweak the router’s own DNS servers or reset its configuration.
Customer
I had Google DNS hardcoded on the laptop from an old setup. Switching back to automatic and doing the IP reset fixed it for that machine. On the phones, forgetting and re-joining the Wi-Fi made them start working too. The only thing still acting up is a gaming PC on Ethernet — it shows internet, but online games keep dropping like the router loses internet connection for a second at a time.
Technician avatar Technician
Nice — so now the modem connection and most devices are fine. Let’s polish stability for that gaming PC.

• Make sure the PC is plugged into a regular LAN port on the router, not into the modem by mistake or a wall jack that bypasses the router.
• Try a different Ethernet cable and a different LAN port; a flaky cable can make it seem like the router keeps losing internet from the modem when it’s really just the link to that PC.
• In the router settings, check for a firmware update and install it — many “router randomly drops internet” issues are solved by a firmware patch.
• On the gaming PC, update the network adapter driver, and temporarily disable VPN or heavy security software that might be inspecting traffic.
• If your router has QoS / Gaming mode, try enabling it and prioritizing that device so it doesn’t get starved when the network is busy.

If other devices stay stable while games drop, we focus on the PC. If the whole network hiccups together, we’ll look at the router’s logs to see if it’s actually dropping the WAN connection to the modem.
Customer
I swapped the cable and updated the router firmware. That seems to have fixed the random drops for the gaming PC — no more disconnects so far. At this point the modem is connected, router shows internet, and all Wi-Fi devices work. Is there anything else I should change so this “router has no internet” situation doesn’t come back every time the ISP or modem glitches?
Technician avatar Technician
Yes — now that the modem, router, and devices are all happy, we can harden things so “modem connected but router has no internet” doesn’t keep returning.

Step D — Make the fix stick long-term
• Keep automatic firmware updates enabled (or check for updates every month or two) on the router so known WAN/DHCP bugs get patched.
• Save a screenshot of your working PPPoE or DHCP WAN settings and your Wi-Fi name/password. If you ever factory-reset the router, you can rebuild the config quickly.
• Change the router’s admin password from the default and disable remote management from the internet to avoid malware taking over the router and killing WAN access.
• Confirm the ISP modem or ONT really is in bridge mode (or has its Wi-Fi disabled). Two routers trying to route at once (“double NAT”) often cause strange no internet from router symptoms.
• If you get frequent power flickers, consider a small UPS/battery backup for both modem and router. That prevents them from boot-looping and ending up out of sync.

With those in place, if the modem ever stays online but the router stops passing internet again, you’ll know to check just a few things: WAN IP, connection type, and the cable between modem and router.
Customer
Got it. I confirmed the ISP box is bridged, took screenshots of the WAN settings, and turned on auto-updates. Everything has been solid for the last hour — no more “Wi-Fi connected, no internet” warnings. Thanks for walking me through all the modem and router checks.
Technician avatar Technician
You’re very welcome — great job working through it.

Summary: When a modem is connected but the router has no internet, first prove the modem internet works directly on a PC, then:
• Check that the modem is cabled into the router’s WAN/Internet port with a good Ethernet cable.
• Power cycle modem and router in the right order so the modem forgets the old device.
• Set the correct WAN type (DHCP, PPPoE, or static IP) on the router so it can obtain a WAN IP.
• Fix LAN/DHCP and DNS on the router and devices so they stop showing “connected, no internet”.

If you ever see the router’s internet light go orange again while the modem stays online, you can open a chat with an expert and we’ll trace the modem-to-router link with you in real time.
Customer
Sounds good. I feel like I actually understand what’s happening between the modem and router now. If this happens again I’ll either follow this checklist or just jump straight into chat with you guys. Thanks again!
Technician avatar Technician
Anytime! If a friend says their modem is connected but the router has no internet or their Wi-Fi shows connected without internet access, you can share this checklist — and if you’d rather have someone click through the modem and router settings with you, just start a chat with an expert and we’ll handle the technical side.

Quick answer: the accepted fix

Accepted fix when a modem is connected but the router has no internet: confirm the modem has a working internet connection directly on a PC, then power cycle modem and router in order, connect the modem to the router’s WAN/Internet port, set the correct WAN type (DHCP, PPPoE, or static IP) so the router gets a real WAN IP address, and reset router and device DHCP/DNS settings so “Wi-Fi connected, no internet” clears on all devices.

Why the modem works but the router has no internet (WAN IP, bridge mode, DNS)

Most modem connected but router has no internet problems are not true ISP outages. They’re usually caused by the router failing to get a WAN IP address from the modem, the wrong connection type (DHCP vs PPPoE), or a modem that was set to bridge mode without the router being configured to log in. Sometimes, people add a new router behind an existing gateway and end up with “double NAT” or conflicting LAN IP ranges, which can also make Wi-Fi say “connected, no internet”.

Thinking of the path as device → router → modem → ISP makes it easier to diagnose. If the internet works when a computer is plugged directly into the modem, then the ISP and modem are fine. The router’s job is to obtain that WAN connection and share it via DHCP and Wi-Fi. When that step breaks, you’ll see symptoms like WAN IP 0.0.0.0, an orange Internet light on the router, or every phone and laptop reporting “no internet access” even though the modem’s Online light is solid.

How to tell if the problem is modem, router, or device

To quickly narrow down a modem connected but router has no internet issue, isolate each piece:

First, connect a computer directly to the modem with an Ethernet cable. If you can browse normally, the modem and ISP are good. Then reconnect the router and log into its admin page to see whether the Internet/WAN status says Connected and shows a valid WAN IP. If the router has internet but one device does not, the problem is likely that device’s network adapter, DNS, or Wi-Fi profile. If all devices are affected and the router shows “Disconnected” or 0.0.0.0 on the WAN, focus on the modem-to-router cable, WAN type, PPPoE credentials, MAC clone, and the physical WAN port.

Modem connected but router has no internet — quick troubleshooting tips

Confirm the modem is online first, then make the router get a proper WAN IP and serve clean DNS to your devices.

Fast path: test the modem directly with a PC → plug modem into the router’s Internet/WAN port → power cycle modem and router in the correct order → set the required WAN type (DHCP, PPPoE, or static IP) → confirm the router now shows a valid WAN IP from your ISP → clear any manual IP/DNS settings on laptops and phones. Keeping firmware updated and avoiding double-router setups helps prevent future “Wi-Fi connected but no internet” and “router has no internet” problems.

Disclaimer: This information is AI-generated and intended for general guidance only. For advice specific to your modem, router model, and ISP, please consult a verified expert on Whizz-Tech before making decisions.

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FAQ

Why is my modem connected but my router has no internet?

Usually the modem and ISP are working, but the router WAN settings are wrong or the modem is still “locked” to a previous device. Common issues include the router not getting a WAN IP address, using the wrong connection type (DHCP vs PPPoE), a bad Ethernet cable or WAN port between modem and router, or firmware glitches on the router. Logging into the router’s admin page and checking the Internet/WAN status will usually show whether the router is actually talking to the modem.

How do I fix “modem connected but router has no internet” on all my devices?

If every device shows Wi-Fi connected, no internet while the modem looks fine, start with the modem–router link. Power cycle the modem and router in order, make sure the modem is connected to the router’s dedicated Internet/WAN port, and configure the router with the correct WAN type and PPPoE or static IP details. Once the router has a valid WAN IP and says “Connected”, turn Wi-Fi off and on on each device or forget/rejoin the network to refresh DHCP and DNS.

What lights should be on when the modem and router both have internet?

On most setups you want a solid Power and Online/Internet light on the modem, and on the router you want a solid Power light, a solid or blinking Internet/WAN light, and activity lights for Wi-Fi (2.4 GHz / 5 GHz) and any active LAN ports. A red or amber Internet light on the router, or a dark Ethernet/WAN light between modem and router, usually means the router is not properly connected to the modem even if the modem itself still shows online.

When should I reset my router to factory settings?

If you’ve verified the modem works directly, checked cables, set the correct WAN type, cloned MAC if needed, and updated firmware but the router still won’t get internet from the modem, a factory reset is reasonable. Press and hold the reset button as instructed by the manufacturer, then rerun the setup wizard with your ISP’s PPPoE or DHCP details. Just be sure you have your Wi-Fi name/password and any PPPoE credentials before resetting.

Sources

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