Why is there no wired internet, but Wi-Fi works: A complete breakdown of the problem

The router distributes Wi-Fi, But there is no wired internet — the problem is most often associated with a broken Ethernet cable, a faulty port on the router or modem, or a failure in the settings IPv4/DHCP on your computer or blocked by your provider (for example, due to non-payment or MAC address binding). Before contacting support, check if the indicator light is on. LAN/WAN on the router, whether the cable works in another port, whether the system returns the error "Network without internet access" or "Unidentified network." In older router models (for example, TP-Link TL-WR841N or D-Link DIR-300) the WAN port often fails, and in new ones (as ASUS RT-AX88U) the problem may lie in incorrectly configured VLAN ID for IPTV or double NAT.

It is important to understand that Wi-Fi and wired connection (Ethernet) often use different data transmission channels within the router. If the wireless network is working, it means the router is receiving internet from the provider and is able to distribute it. The problem lies in the "cable → port" chain. LAN/WAN → device network card." We'll go through each link in this chain to identify the weak point.

This article will be useful for both novice users and those who have already tried rebooting the router but still don’t understand why. The internet via cable disappeared after updating the router firmware or changing the provider's tariff.We will pay special attention to cases where the problem appears only on one device (for example, on PC, but not on Smart TV) is a key sign for diagnosis.

1. Physical damage to the cable or ports

Let's start with the most obvious: cable break or damaged connectors. Even if the cable appears intact, the internal wires may have broken (especially if it's been frequently kinked or stepped on). Check:

  • 🔌 Connector status RJ-45: bent or oxidized contacts, cracks in the plastic.
  • 📏 Cable integrity: folds, cuts, marks from pets.
  • 🖥️ Port Ethernet on the device: Try connecting the cable to a different port on your router or PC.

If you have a spare cable, replace it. If not, temporarily use a cable from another device (for example, from IPTV set-top boxes). Also pay attention to the port indicators on the router: a lit green/orange LED next to the connector LAN/WAN indicates a physical connection. If the indicator is off or flashing red, the problem lies with the physical connection.

Damage is especially common in areas where cables pass through doorways or are pinched by furniture. If you recessed wiring (the cable is hidden in the wall), check the sockets RJ-45 - sometimes the contacts in them oxidize or come loose.

2. Incorrect router settings: VLAN, PPPoE and port priorities

If everything is physically in order, but there is still no internet via cable, the problem may lie in the router settings. Modern models (for example, Keenetic, ASUS RT-AX88U, TP-Link Archer) support flexible traffic distribution schemes, which sometimes get disrupted. Here are the key points:

  • 🌐 Connection type (WAN): if the provider uses PPPoE, L2TP or DHCP, but the settings are lost, the router can distribute Wi-Fi (local network), but do not send traffic to the Internet via cable.
  • 🔢 Tags VLAN: some providers (eg Rostelecom, Beeline) require instructions VLAN ID for a wired connection. If this parameter is missing or incorrect, cable internet will not work.
  • 🔌 Port binding: the router settings may have the "Port Isolation» (port isolation), in which LAN-ports are not accessed WAN.

To check these parameters:

  1. Go to the router's web interface (usually at 192.168.1.1 or 192.168.0.1).
  2. Go to the section Internet (or WAN) and make sure that the connection type meets the provider's requirements.
  3. Check the section Local area network (LAN) - there shouldn't be any checkmarks opposite Isolate ports or Disable DHCP for LAN.
How can I find out VLAN settings from my provider?

Many providers specify the VLAN ID in their contract or personal account. If this information isn't available, call support and ask, "Do I need a VLAN for my wired internet connection?" Check if a separate VLAN is required for IPTV—sometimes conflicts arise due to incorrect port mapping.

If you recently updated your router's firmware, it may have reset the settings. In this case, a full factory reset (press the button) will help. Reset on the rear panel) and re-configuration.

3. Problems with the network card on the device

If Wi-Fi works, but there is no wired internet only on one device (for example, on PC or laptop), the network card or its drivers are at fault. Here's what to check:

  • 🖥️ Driver status: go to device Manager (on Windows click Win + X → Device Manager) and find the section Network adaptersIf there is an exclamation mark next to the name of your network card, the driver is not working correctly.
  • 🔄 IP address conflict: if your device receives IP from another range (for example, 169.254.x.x), this means that DHCP- The router's server isn't providing the address. Try entering it manually. IP, DNS And gateway.
  • ⚡ Energy saving: on laptops Windows Sometimes it disables the network card to save battery power. Go to the adapter properties and disable this option. Allow the computer to turn off this device to save power.

To update your network card driver:

  1. Open device Manager.
  2. Find your adapter (eg. Realtek PCIe GBE Family Controller or Intel(R) Ethernet Connection).
  3. Right click → Update driver → Automatic search.
  4. If the driver is not found automatically, download it from the manufacturer's website (for example, for Realtek - With www.realtek.com).

Laptop|Desktop PC|Smart TV|Game Console (PS/Xbox)|Other-->

If the problem persists after updating the drivers, try connecting the cable to another device. If the internet works on that device, the problem is definitely with the network card or settings. OS.

4. IP address and DNS server conflict

One of the common reasons why the wired internet doesn't work, A Wi-Fi there is a conflict IP-addresses or incorrect settings DNSThis can happen after:

  • 🔄 Changes in the provider's tariff (changed DNS-servers).
  • 🖥️ Connections to another network (for example, a static connection was used at work) IP).
  • 🛠️ Manual editing of network parameters.

To diagnose the problem:

  1. Click Win + R, enter cmd and run the command: 
    ipconfig /all

    Check which one IP-the address is given by your device. If it starts with 169.254, Means, DHCP didn't work.

  2. Try to enter it manually DNS from Google (8.8.8.8 And 8.8.4.4) or Cloudflare (1.1.1.1).
  3. Execute the commands one by one: 
    ipconfig /release

    ipconfig /renew

    This will force a refresh. IP-address.

If the Internet works after these manipulations, the problem was in the settings TCP/IPTo avoid this in the future, reset your network settings to factory defaults:

netsh int ip reset

netsh winsock reset

Open command prompt (cmd)

Run ipconfig /all

Check that the IP is not 169.254.xx

Enter DNS manually (8.8.8.8)

Reboot your router and PC-->

If the problem persists after resetting, your ISP may be blocking your MAC-address. In this case, clone MAC another device in the router settings (section MAC Clone).

5. Problems on the provider's side: blocking and restrictions

Sometimes the lack of wired internet isn't due to your equipment, but to your provider's policies. Here are some scenarios:

  • 🔒 Blocking by MAC-address: Some providers tie access to a specific device. If you've changed your router or network card, the new one MAC may be blocked.
  • 📡 Connection type limitation: in cheap tariffs the provider may only allow Wi-Fi-access by blocking a wired connection (for example, via PPPoE-sessions).
  • 🔄 Failure on the provider's side: Sometimes after updates on the provider's servers, the settings are lost VLAN or DHCP.

To check this version:

  1. Connect the cable directly to PC (bypassing the router) and try accessing the internet. If it doesn't work, the problem is definitely with your ISP.
  2. Call support and clarify:
    • Is binding required? MAC-address?
    • Is there a limit on the number of wired devices?
    • Is yours being blocked? IP for suspicious activity?
  • Try changing it MAC- the router address to the one that was on the previous device (if you have saved it).

    • Some providers (eg MGTS or Dom.ru) use technology Double Tagging VLAN, when for the Internet and IPTV different tags are required. If the settings are wrong, the router can "see" the internet via Wi-Fi (local area network), but do not let it into the wire.

    6. Software blocks: firewalls, antiviruses, and security policies

    If all the previous steps fail, check to see if software is blocking your wired internet access. Common culprits include:

    • 🛡️ Firewall Windows: Sometimes after updates it starts blocking network connections. Try temporarily disabling it. Control Panel → Windows Defender Firewall.
    • 🦠 Antiviruses: Kaspersky, ESET NOD32 or Avast may block unfamiliar connections. Add your network to the exceptions.
    • 🏢 Corporate policies: If you connect to the network at work, your administrator may have restricted wired access through Group Policy.

    To diagnose the problem:

    1. Disable your antivirus and firewall for 5-10 minutes and check if the Internet is back online.
    2. If you use VPN, disable it - sometimes it conflicts with a wired connection.
    3. Check the section Network connections (Win + R → ncpa.cpl): if next to Ethernet there is a red cross or inscription Unidentified network, the problem is in the security settings.

    If the internet works after disabling the firewall, add an exception for your network. Windows 10/11 it's done like this:

    1. Open Windows Defender Firewall → Advanced settings.
    2. Go to Inbound Rules → New Rule.
    3. Select For the program → specify the path to svchost.exe (usually in C:\Windows\System32).
    4. Allow the connection for your local network.

    7. Hardware failures: router, switch, or network card

    If none of the previous methods worked, it might be because hardware failureHere's how to check:

    • 🔌 Port WAN on the router: connect the provider's cable to another port (if the router supports Multi-WAN). If the Internet works, the port is burned out.
    • 🖥️ Network card on a PCTry connecting the cable to another device. If you can connect to the internet there, your network card is faulty.
    • 🔄 Router overheatingIf the router is hot to the touch, its chips may be faulty. Try cooling it down (unplug it for 30 minutes).

    Typical signs of hardware failure:

    Symptom Probable cause Solution
    Indicator WAN does not burn The port burned down WAN or a problem with the provider's cable Try a different cable or port; contact your ISP.
    The router constantly reboots Power supply or microcircuit failure Replace the power supply; reset the settings
    There is Internet access only on one device. Glitch DHCP-servers or ports LAN Update firmware; check settings LAN
    The speed via cable is much lower than via Wi-Fi Problems with the network card or cable Cat.5e Replace the cable with Cat.6; update drivers

    If your router is older than 5 years, there's a high probability that its hardware has worn out. In this case, the only solution is to replace the device. When choosing a new router, consider models with metal ports LAN/WAN (For example, ASUS RT-AX86U or Netgear Nighthawk) - they are less susceptible to mechanical damage.

    FAQ: Frequently asked questions about the problem

    Why doesn't my laptop have cable internet, but my phone works via Wi-Fi?

    This is a typical situation where the problem lies in the laptop's network card settings or drivers. Start by checking:

    1. Open device Manager and update the network adapter driver.
    2. Check if the adapter is disabled in Network connections (Win + R → ncpa.cpl).
    3. Try turning it off IPv6 in the connection properties (sometimes it conflicts with IPv4).

    If this doesn't help, it's possible that corporate policies have been set on the laptop (for example, after connecting to a work network). Reset the network settings with the command netsh int ip reset.

    My router is distributing Wi-Fi, but the cable says "No internet access." What should I do?

    This error means that the device is receiving local IP, but cannot access the global network. Reasons:

    • Incorrect settings WAN on the router (for example, incorrect VLAN ID).
    • Blocking MAC-addresses by the provider.
    • Glitch DHCP-servers on the router.

    Solutions:

    1. Restart your router and PC.
    2. Check your settings WAN in the router's web interface.
    3. Try connecting the cable to a different port. LAN.
    After updating my router firmware, my wired internet connection disappeared. How can I restore it?

    The firmware update may have reset the settings. VLAN, PPPoE or DHCPFollow these steps:

    1. Perform a full reset of the router (button Reset for 10–15 seconds).
    2. Reconfigure your connection using the details in your contract with your provider.
    3. If the problem persists after the reset, roll back the firmware to the previous version (if the router supports it).

    If the router Keenetic, check the section Internet → Connection — the protocol could have gotten confused there (PPPoE, L2TP or DHCP).

    There's a yellow triangle on the network icon on my PC. What does it mean?

    A yellow triangle with an exclamation mark means you're connected, but there's no internet access. Reasons:

    • Incorrect settings IP or DNS.
    • Conflict with antivirus or firewall.
    • Problems on the provider side (for example, a failure DHCP).

    Solutions:

    1. Open the command prompt and run:

    ipconfig /release
    

    ipconfig /renew
    

    2. Enter DNS manually (8.8.8.8).
    

    3. Disable your antivirus during the scan.

    Could it be the provider's fault if Wi-Fi works but the cable doesn't?

    Yes, but that's unlikely. Typically, your ISP either provides internet to all devices or doesn't provide it at all. However, there are exceptions:

    • The provider is blocking MAC- your PC address (for example, due to suspicions of DDoS-attacks).
    • Your plan has a limited number of wired devices (rare, but it happens).
    • The settings on the provider's side have gone wrong VLAN for your connection.

    To check, connect the cable directly to your PC (bypassing the router). If the internet still doesn't work, call support.

    If the problem persists after all the checks, contact your provider and ask them to check the line. Check if there have been any recent changes to the infrastructure (for example, switching to GPON instead of Ethernet). Sometimes, all it takes to restore wired internet is for a technician to reconnect your cable at the switch.

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