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I have a Zyxel P-660HW router which has worked just fine till date. I got a new internet connection which uses an ethernet cable for the WAN connection with PPPoE setup. My wireless router's DSL port can only accommodate a telephone cable. I heard that one of the LAN ports can be used as a WAN port.

Does any one know how I can achieve this?

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Can't use another port but you can do Traffic Redirect / WAN backup which sends the traffic through another gateway when the connection is down.

Zyxel P-660HW User Guide - 5.7 Traffic Redirect / 5.8 Configuring WAN Backup

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