Web-based Configuration Guide Networks Settings
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Figure 3-1 WAN Port Settings
3.4 Changing the MTU
Sometimes, the ISP restrict the speed of large data packets or prevent large data packets from passing through.
As a result, the network speed is low or even the network is disconnected. In this case, you are required to set
the maximum transmission unit (MTU) to a smaller value.
Mobile Phone View: Choose More > Switch to PC view > More > Basics > WAN > Advanced Settings.
PC View: Choose More > Basics > WAN > Advanced Settings.
The default MTU value is 1500, which is the maximum MTU size. You are advised to gradually adjust the value
to 1492, 1400, or even smaller if necessary.