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I have two modes similar this:

enter image description here

I live on the first floor of an apartment. Also one of the mentioned modem is inside my apartment (connected to the ADSL port) and has internet as well. I connect to it using my cellphone (through WiFi) and laptop (through LAN cable) and use the internet; all fine.

Recently I've bought 25 Meter of CAT6e LAN cable to share my internet with a modem located on the second floor of apartment. I did the wiring as well (I've plugged in one end of the LAN cable to port 2 of my modem and the other end to port 2 of my upstairs modem).

Also, I've set bridge mode for the upstairs modem. Now, when I get connected to the upstairs modem, sometimes it has internet as well, but sometimes I see a exclamation-mark on the WiFi icon (on my cellphone) and there is no internet.

My first question, why does it work sometimes and not always? And how can I fix the issue?

The exact name of modes if needed:

  • The main one (on my apartment): D-link 2740u
  • The upstairs one: Tp-link TD-W8961N_V4
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  • Did you disable DHCP service on the upstairs modem?
    – grawity_u1686
    Commented May 2, 2022 at 11:01
  • @user1686 No, it's enabled. I cannot find any button to make it disable through the modem's interface.
    – Shafizadeh
    Commented May 2, 2022 at 11:11
  • How about "Interface setup" or similar section that lets you change the DHCP range? Disabling it is something you will need to do.
    – grawity_u1686
    Commented May 2, 2022 at 11:57
  • @user1686 I see.. Sure, I will try to make it disable .. thanks
    – Shafizadeh
    Commented May 2, 2022 at 11:58

1 Answer 1

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In short, when a device is supposed to work as a bridge alongside an existing router, it must not have its own DHCP server active as well – otherwise your devices will frequently pick up the wrong "gateway" via DHCP (and possibly wrong other configuration).

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  • Ok, when I want to make the DHCP server disable, it asks me for "gateway" and "dns" .. what should I write there?
    – Shafizadeh
    Commented May 2, 2022 at 13:19
  • Are you sure that's not the DHCP client section (WAN port) that you found?
    – grawity_u1686
    Commented May 2, 2022 at 13:27

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