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7. MTU Size
Most router WAN ports, regardless of interface type, are set to a maximum transmission
unit (MTU) default size of 1500 bytes, which is larger than cellular networks can handle
without fragmentation. Some payloads will fail in the IP network if fragmented. Others
will suffer delay due to fragmentation in the network.
Always set the MTU size in the router to 1342 to avoid IP network performance issues.
An example of where to set it on the Peplink BR1 ENT router is shown below.
On the Dashboard, click on the USB or WAN (the one to which the AC-HPUE is
connected) Details button.
Then under Physical Interface Settings, select custom and set the value to 1342
