Determining what my new LG Smart TV is up to



  • I've recently bought an LG "Smart TV", plugged its ethernet cable into my network, and the TV appears to be doing something bad to my network.

    When the TV is connected, every 3 hours or so my local network goes down. All the devices on the network lose connectivity, both internally and outside to the internet. For example, local machines lose connectivity to the NAS, and also local machines lose connectivity to the internet. This network dropout last for around 30 seconds, then everything comes back up.

    I unplug the TV's network cable and this problem goes away. No more network dropouts.

    I'm interested to see what the heck this TV is doing every few hours. Obviously I can see the TV's local IP address (192.168.x.y). What would be the best way to log and analyze the traffic from the TV? Ntopng seems popular here; is this an appropriate choice? Any suggestions would be appreciated.

    Thanks a lot.



  • @frankvh Well, if you haven't done so already, setup a LAN rule to log all traffic from the LG, then filter the FW log by IP. That's a start



  • Also try Status > pfTop and filter by the TV's IP address (host 192.168.x.y).

    Tutorial here.



  • Thanks for the replies. I've been doing packet captures & examining them in wireshark. It's rather fascinating. First of all, I'm wrong about the TV - I've managed to have a network problem with the TV unplugged from the network. Can't blame the TV! But I've seen other things. For example, my Yamaha audio-visual receiver gets on the network every few seconds and asks, "Who has 192.168.1.255?" No idea why it's asking that, over and over again - predictably it doesn't get any reply. That's a bit strange. It's all good fun.



  • @frankvh said in Determining what my new LG Smart TV is up to:

    Thanks for the replies. I've been doing packet captures & examining them in wireshark. It's rather fascinating. First of all, I'm wrong about the TV - I've managed to have a network problem with the TV unplugged from the network. Can't blame the TV! But I've seen other things. For example, my Yamaha audio-visual receiver gets on the network every few seconds and asks, "Who has 192.168.1.255?" No idea why it's asking that, over and over again - predictably it doesn't get any reply. That's a bit strange. It's all good fun.

    x.x.x.255 is a broadcast, meaning it is telling everyone that it is there, so nothing very strange.


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