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No Internet Connection on TP-Link Archer C20 Router: WiFi Issues on Z3 Phone, Laptop & Tablet

darq_1 4515 13
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  • #1 16930284
    darq_1
    Level 9  
    Posts: 93
    Rate: 1
    Hello!!

    I have a new tp-link archer c20 router after configuration, the wireless network works but there is no internet connection. For example, on the z3 phone I have internet with wifi after leaving the house and returning the signal is there but there is a message no internet after removing the network and reconnecting (entering the password) internet signal no turning off and turning on wifi on the phone solves the problem (signal and internet available) after going out of range of the router again, the situation repeats turning off and on again wifi on the phone does not help you have to delete the network from the phone's memory each time I also have this problem on my laptop and tablet. Is there a badly configured router, if so, what are the settings because I tried different variants from google and it is always the same ??

    greetings
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  • #2 16930397
    dt1
    Admin of Computers group
    Posts: 47956
    Help: 7261
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    Welcome.
    What operator services do you use, what is the router connected to (access device model)?

    Did you have any computer connected to this service without a router, on which the internet was working? If so, reconnect it, without a router, to have internet on it and from the Windows command prompt enter the ipconfig / all command - show its results.
  • #3 16930471
    darq_1
    Level 9  
    Posts: 93
    Rate: 1
    Everything goes on wifi, nothing is connected to the router (when it comes to receivers) The service I have from our local company (radio) is an antenna on the roof, adapter, PoE / LAN power supply, router
    Attachments:
    • No Internet Connection on TP-Link Archer C20 Router: WiFi Issues on Z3 Phone, Laptop & Tablet Bez tytułu 1.png (278.84 KB) You must be logged in to download this attachment.
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  • #4 16931266
    dt1
    Admin of Computers group
    Posts: 47956
    Help: 7261
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    At the time you took this screenshot, you were using a wireless network adapter on your computer. What does this card connect to?
    - with some operator device outside the window?
    - with some operator device (router) in your apartment?
    - directly with the antenna mounted on the roof?

    You write that you have an antenna (rather CPE), power supply to it - so I expected the computer to be connected to this device via twisted-pair cable.

    Unless you have one operator router and you want to buy a second one for some reason (only here, the question is whether you want to replace it or connect yours for some reason).
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  • #5 16931330
    darq_1
    Level 9  
    Posts: 93
    Rate: 1
    The laptop is connected via wifi to the tp link archer c20 router as I wrote above, radio internet on the roof antenna cable from it goes to the LAN adapter and from it to the router from which I have internet for the whole house I do not use the cable connection all the equipment connects to router using wifi
  • #6 16931380
    dt1
    Admin of Computers group
    Posts: 47956
    Help: 7261
    Rate: 8186
    darq_1 wrote:
    The laptop is connected via wifi to the tp link archer c20 router
    darq_1 wrote:
    LAN adapter from it to the router from which I have internet for the whole house

    Is it talking about one and the same router, or are they two separate routers, because it cannot be clearly determined from your statements.
  • #7 16932127
    darq_1
    Level 9  
    Posts: 93
    Rate: 1
    There is only one router another does not exist

    Added after 5 [hours] 14 [minutes]:

    I noticed that when the internet is available, the IP is 192.168.3.XX and when there is no internet the IP is 192.168.2.XX. What to do to assign an IP device in the range of 192.168.3.XX ??
  • #8 16932772
    dt1
    Admin of Computers group
    Posts: 47956
    Help: 7261
    Rate: 8186
    Has someone already set up this router to work on this network?
    - if so, go to the management of this router through the browser and show the settings for WAN
    - if not, then insert the LAN cable from the PoE adapter directly to the computer (by the way, make sure that you are not connected to WiFi at the same time) - is this the way the internet works? If so, then do ipconfig / all and pop it up.
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  • #9 16932877
    KOCUREK1970
    Network and Internet specialist
    Posts: 35131
    Help: 3786
    Rate: 5326
    darq_1 wrote:
    tp link archer c20

    You have reset the router with the button (you will lose all settings and you will have to reset TP Link!), Has this TP Link firmware up to date?
  • #10 16932951
    darq_1
    Level 9  
    Posts: 93
    Rate: 1
    The internet provider told me to replace the cable from the lan port to the wan port in the router and the internet works, unfortunately, I did not find out what caused the assignment of 2 different ip
  • #11 16932975
    KOCUREK1970
    Network and Internet specialist
    Posts: 35131
    Help: 3786
    Rate: 5326
    @ darq_1
    As the cable was in the LAN - TP Link was a kind of AP (but then it did not assign an IP because its DHCP server was turned off). When the cable is in the WAN, the DHCP server built into TP Link is responsible for assigning the address and now it assigns the IP.
  • #12 16932987
    darq_1
    Level 9  
    Posts: 93
    Rate: 1
    This is how to configure the router so that the LAN assigns a good ip
  • #13 16933005
    KOCUREK1970
    Network and Internet specialist
    Posts: 35131
    Help: 3786
    Rate: 5326
    In the TP Link options, there should be an option to assign a given IP (previously entered manually), then restart all devices and from then on, each device introduced there has the same IP assigned earlier.
    You configure the DHCP server in the option:
    DHCP-DHCP Settings
    And you enter specific IP data and add here:
    DHCP-DHCP Address Reservation.

    It is also worth uploading the latest software available on the router manufacturer's website to TP Link and then enter this data and save the settings in a backup copy in a file on your computer.
  • #14 16933363
    dt1
    Admin of Computers group
    Posts: 47956
    Help: 7261
    Rate: 8186
    darq_1 wrote:
    This is how to configure the router so that the LAN assigns a good ip

    First of all, you should know the parameters needed to configure the connection. We can guess them the next few posts, or maybe a colleague call the service office and receive such information within a five-minute phone call.

    If we want to guess - it would be appropriate to connect the CPE cable ("antennas") directly to the computer and see what happens (with the ipconfig command).

Topic summary

✨ The discussion revolves around a user experiencing internet connectivity issues with a TP-Link Archer C20 router. After initial configuration, the wireless network is operational, but devices such as a Z3 phone, laptop, and tablet frequently lose internet access upon reconnecting to the network. The user notes that the IP address changes from 192.168.3.XX (when internet is available) to 192.168.2.XX (when it is not). Solutions proposed include ensuring the WAN port is correctly connected to the internet source, configuring the DHCP settings to assign static IP addresses, and updating the router's firmware. The user ultimately resolves the issue by connecting the LAN cable to the WAN port as advised by the internet provider, which restored internet access.
Generated by the language model.

FAQ

TL;DR: Fix "Wi‑Fi connected, no internet" on TP‑Link Archer C20 by using 2 DHCP menus—"DHCP Settings" and "DHCP Address Reservation"—and, as one expert notes, "configure the DHCP server." [Elektroda, KOCUREK1970, post #16933005] Why it matters:** It solves roaming dropouts and wrong IPs on phones, laptops, and tablets without buying new hardware.

Who this is for: home users with radio/CPE internet feeding a TP‑Link Archer C20 who see Wi‑Fi but no internet.

Quick Facts

How do I fix “Wi‑Fi connected, no internet” on a TP‑Link Archer C20 with radio internet?

Plug the ISP/CPE cable into the router’s WAN port, not a LAN port. Reboot the router. Reconnect your devices to Wi‑Fi. This change lets the router issue correct IPs and restores internet access. Users confirmed the internet worked immediately after moving the cable. [Elektroda, darq_1, post #16932951]

Why do my devices get 192.168.2.x sometimes and 192.168.3.x other times?

They were receiving IPs from different DHCP sources. With the ISP cable in LAN, the TP‑Link behaved like an access point and didn’t assign addresses. With the cable in WAN, its DHCP server assigned the proper subnet. “When the cable is in the WAN, the DHCP server…assigns the IP.” [Elektroda, KOCUREK1970, post #16932975]

Where exactly should the PoE/CPE cable plug into the Archer C20?

Connect the Ethernet from the PoE/LAN power supply (feeding the roof CPE) to the blue WAN port on the Archer C20. After moving it from LAN to WAN, the reporter regained internet on all devices. [Elektroda, darq_1, post #16932951]

What is CPE in a radio internet setup?

CPE means Customer Premises Equipment. It’s the outdoor unit or antenna on your building that talks to the provider. Your router connects to the CPE via a PoE power supply and Ethernet. The helper clarified this when diagnosing the link path. [Elektroda, dt1, post #16931266]

What is a PoE/LAN power supply (injector)?

It’s the small adapter that powers the roof CPE through Ethernet and provides a LAN port for your router. In this case, the path was antenna → adapter → router. Ensure its LAN port feeds the router’s WAN port. [Elektroda, darq_1, post #16930471]

Is my Archer C20 acting as a router or just an access point?

If the ISP feed is in a LAN port, it behaves like an access point and typically doesn’t run DHCP. In the WAN port, it routes and assigns IPs via its DHCP server. That difference decides whether clients get working internet. [Elektroda, KOCUREK1970, post #16932975]

How do I reserve a static IP for a device on the Archer C20?

Open the TP‑Link UI. Go to DHCP → DHCP Settings to enable DHCP. Then use DHCP → DHCP Address Reservation to bind a device’s MAC to a chosen IP. Save and reboot clients for leases to refresh. “Configure the DHCP server” first. [Elektroda, KOCUREK1970, post #16933005]

My phone only works after forgetting the network—what’s happening?

The device kept a stale Wi‑Fi session while the router handed out a different subnet later. Forgetting and re‑joining renewed the lease and route. The user reported it recurred after leaving and returning home until the cabling/DHCP issue was fixed. [Elektroda, darq_1, post #16930284]

Do I need a second router for whole‑home Wi‑Fi here?

No. The thread confirms a single Archer C20 served the home. The issue was cabling and DHCP role, not the number of routers. Move the ISP cable to WAN and configure DHCP correctly. [Elektroda, darq_1, post #16932127]

How can I quickly verify the ISP feed without the router?

Connect the CPE/PoE LAN cable directly to a computer by Ethernet. Disable Wi‑Fi on that computer. Run ipconfig /all and check if you receive a valid address and gateway from the provider. Share those results if needed. [Elektroda, dt1, post #16932772]

Should I call my ISP for exact parameters?

Yes. One helper noted you could get the required settings in a “five‑minute phone call.” Ask about DHCP vs. PPPoE, VLANs, and any MAC binding. Then apply them on the Archer C20. [Elektroda, dt1, post #16933363]

Will a firmware update help stability on the Archer C20?

Updating to the latest TP‑Link firmware is recommended. After updating, re‑enter DHCP settings, set Address Reservations if needed, and export a config backup for safety. This improves reliability and recovery after changes. [Elektroda, KOCUREK1970, post #16933005]

What were the actual working vs. non‑working IP ranges in this case?

Working sessions used 192.168.3.x. Non‑working sessions showed 192.168.2.x. That mismatch flagged the DHCP role problem and guided the WAN‑port fix. The reporter observed this pattern before resolving the issue. [Elektroda, darq_1, post #16932127]

Three‑step how‑to: restore internet on Archer C20 with radio ISP

  1. Move the PoE/ISP Ethernet from a LAN port to the blue WAN port.
  2. Power‑cycle the Archer C20.
  3. Reconnect devices to Wi‑Fi and test browsing. Users confirmed success immediately after step 1 in this case. [Elektroda, darq_1, post #16932951]

Edge case: Why didn’t toggling Wi‑Fi on my phone fix it permanently?

Toggling Wi‑Fi only refreshed the device session. It didn’t correct the router’s role. The connection failed again after leaving range, until the cable was moved to the WAN port and DHCP served consistent leases. [Elektroda, darq_1, post #16930284]

Quick check: how many routers were involved here?

Exactly one. The poster confirmed no second router existed. That ruled out double‑NAT and focused troubleshooting on the Archer C20’s port and DHCP configuration. [Elektroda, darq_1, post #16932127]
Generated by the language model.
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