LG Television and MTU size

Bought a LG CX Class 4K Smart OLED TV with AI ThinQ® TV recently. When I connected the TV to my home router, I was able to surf the internet but the in-built LG Content Store, Spotify , Netflix and YouTube app keeps giving me “Unstable Network Error (Error Code 324)“.

I have tried the following:

  1. Reset network router
  2. Reset TV to initial settings
  3. Update TV software to the latest version
  4. Change the service country instead of using Auto settings
  5. Changed the DNS to 8.8.8.8
  6. Power cycle/ on and off the TV
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What works for me finally is to change the MTU setting for my router from MTU 1500 to MTU 1472.

In computer networking, the maximum transmission unit (MTU) is the size of the largest protocol data unit (PDU) that can be communicated in a single network layer transaction. The MTU relates to, but is not identical to the maximum frame size that can be transported on the data link layer, e.g. Ethernet frame.

Larger MTU is associated with reduced overhead. Smaller MTU values can reduce network delay. In many cases, MTU is dependent on underlying network capabilities and must be adjusted manually or automatically so as to not exceed these capabilities.

To determine the MTU size:

Command on Mac :

ping -D -s 1444 www.google.com

After finding the optimal values, add 28 to that. In my case is 1444+28 = 1472

Equipped with the above, after changing the MTU for the router and TV, I have proceed to make the MTU size on my Mac the same as that on the router.

Setting MTU under Mac

Source : https://web.archive.org/web/20180627061040/http://www.bestyoucanget.com/optimizemtu.htm

There is a Jumbo MTU setting available on the Mac. When the setting is changed to Jumbo or 9000 MTU, the latency of the system drops to 1ms.

latency with MTU 9000
latency with MTU 1500
latency with MTU 1472

Other interesting Readings:

  1. How 1500 bytes became the MTU of the internet

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