Tenda 3G150M User Manual page 37

Note: it is suggested you choosing Connect on Demand without
running up bills, because it can disconnect the internet
automatically when there is no data transmitting or the computer
closed. If you access the internet, it will dial up automatically
which is very convenient.
5.2.2 WAN Settings in WISP Mode and Wireless Router Mode
Depending on your access ways of WAN port, there are three
ways of configuration.
a. Dynamic IP
MTU: Maximum Transmission Unit. It is the size of largest
datagram that can be sent over a network. The default value
is 1492. Do NOT modify it unless necessary. But if some
specific website or web application software can not be open
or enabled, you can have a try to change the MTU value as
1450, 1400, etc.
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