ZTE_ ZXDSL_831_SERIES_ADSL_Router_WAN_Setting

Now go to Advance from top menu

Select WAN under Internet Connection Configuration

As you can see in the image there are three settings

And two of them are editable one is set default

PVC Name	VPI/VCI	Category	Protocol	NAT	WAN IP Address	Edit
pppoe_0_35	0/35	UBR	PPPoE LLC/SNAP	On	Automatically Assigned
ipoa_1_39	1/39	UBR	IPoA LLC/SNAP	Off	192.168.2.1
br_0_32	0/32	UBR	Bridge LLC/SNAP	*	*

pppoe_0_35 (0-35 is used for PPPOE PPP over Ethernet /Multiple Login)

ipoa_1_39 (Adsl Modem Router Default setting non editable)

br_0_32 (0-32 is used for bridging mode)

What you have to do is to add the first one that is 0 -35 automatic mode

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