WAN connectivity failure every 5 minutes on Technicolor router

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Starting recently, my MacBook Pro running OS X 10.11.2 loses its Internet connection every five minutes or so.

My router, a Technicolor TC8717T (don't ask, it's the free one from my ISP) provides two wifi networks:

  • TC8717T88 (2.4 GHz)
  • TC8717T88-5G (5 GHz)

Regardless of which wifi network I'm connected to, the Internet connection will die after about five minutes. The computer will remain connected to the wifi network, at full signal strength, but I'll be unable to browse to any websites or do anything over the Internet.

When this happens, Network Diagnostics will report that the connection to my ISP is failing, and Wireless Diagnostics will report a "WAN Connectivity Failure" and advise that I restart my router.

At this point, if I do any of the following…

  • Switch to the other network (from 2.4 GHz to 5 GHz or vice versa)
  • Disconnect from and reconnect to the same network
  • Turn my wifi off and back on
  • Restart my router

…the Internet connection will be restored, but only for another five minutes or so, until it fails again in the same fashion.

What could be causing this, and is there anything else I can try?

Update: two other pieces of info that I've discovered:

  • When the connection drops, other devices on the same wifi network remain connected. For example, my Apple TV will continue to stream a show, even though the MacBook Pro has lost the connection
  • …but at the same time, my MacBook Pro only exhibits this issue on my home wifi network. For example, on my office wifi, the connection is always stable

Here's a screenshot of my network settings:

Network Settings

Best Answer

I suggest you to turn off the 2.4 GHz wireless network named TC8717T88 on your router. Then your Automatic location will stop magically switching from one to the other wireless networks, thus having the valid IP for the other network (which doesn't fit the DHCP lease of the actual one).

You will be able to change this from a perfectly connected computer (ideally through Ethernet). Open your web browser, and connect to your TC8717T router with:

http://192.168.0.1

login:          admin
password:       password

goto:

Gateway > Connection > WiFi

click:

EDIT

Configure as disabled the "Private WiFi Network Configuration (2.4 GHz)". Configure on Manual channel choice the "Private WiFi Network Configuration (5 Ghz)".

I made the hypothesis (which is quite often the case) that your 2.4 GHz is overloaded and sometimes subject to access failure due to interfering neighbours network. Then by forcing your connexion on 5 GHz and a given channel you will get a stable one, without anymore dynamic IP renewal.

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