Discovered a bug in Chromecast that causes routers malfunction

If in recent times your modem/router has given signs of instability, before replacing it, try disconnecting your Chromecast first!

The issue could be due to an unspecified defect either on Chromecast or Google Home. Most likely Google Home, the App that controls it. A TP-Link engineer has posted an explanation of the problem that first popped out in questions around the last year’s October.

It is not a very serious malfunction, but equally capable of putting in difficulty many famous modems/routers like TP-Link, Synology, Asus, Linksys and Netgear in particular, among others.

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Depending on your modem/router brand it could cause a temporary internet disconnection, or even a permanent unavailability of the network, until a complete reset.

TP-Link and Linksys have already confirmed the issue on their devices, for other brands we’re still awaiting for a coming-out, the list of devices is growing day by day.

If you’re interested in more details about the technical side of the issue, and want to try a solution for it, read the following lines in which I’ll give some technical explanations.

From what TP-Link engineers have gathered so far, the issue appears to be related to some recent releases of the Android OS and Google Apps. The issue originates from these devices’ “Cast” feature, which sends “MDNS” multicast discovery packets in order to keep a live connection with Google products such as Google Home.

The interval between each of these cast packets is normally about twenty seconds, some say two of them every twenty seconds.

Some technical details, and how to fix it

This problem occours when the device is awakened from “sleep mode”, and could send more than 100,000 packets in a short amount of time. The longer your device is in “sleep mode”, the larger this packets burst will be.

Due to the flood of packets the router will shut down connections, either to the internet or to the connected devices.

Generally, you will need to perform a reboot of your modem/router to release the memory and temporarily solve this issue, plus you have to disconnect your Chromecast.

You may also try disabling the “Cast” feature on your Android device to help mitigate the issue until an update is released to permanently fix it on the device itself.

Linksys and TP-Link router owners can try to update the firmware of their device to tackle the issue.

If the problem resided on the Apps compatible with Chromecast, an App update might do the trick, but if it was inherent to the operating system, Android Oreo is surely affected, you might end up waiting for an OS update: it might take longer.

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2 thoughts on “Discovered a bug in Chromecast that causes routers malfunction

  1. Interesting post, but the bug has been resolved.
    So what’s the problem?

  2. Hello Anatolij,
    you’re reading this post after more than a year it was written.
    Things change swiftly at Google and the problem is solved.
    Let’s hope we don’t find similar ones for our Chromecast in the future again.

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