Tenda 3G150M User Manual page 30

Account and Password provided by your ISP.
Note: If you choose this access way, the LAN/WAN port is only
worked as the WAN port. The mode will take effect once you set it;
you need to login to the Router's WEB interface to configure the
device (Details refer to 3.2). After configuration, you should
adjust the connection properties to obtain an IP address
automatically in Internet protocol (details refer to Appendix One).
d . PPTP and L2TP
Configure L2TP and PPTP. Take PPTP as an example.
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