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Ask the Expert- SD-WAN

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need help in troubleshooting vpdn sessions in ISP

hi  ,

i have the topology below :

http://www.rracuares.com/wp-content/uploads/2010/07/PPPoE-over-L2TP.png

note that my access is only on L2TP LNS router ,

this topology describe an adsl that connect customers from home to internet using ADSL Modems .

note that pppoe client in this topology is replaced with ADSL modems .

the problem is ,

many customers suffers that the internet is lost , but the adsl led and internet led is on, on thier modems ,

i mean that an interrup in internet is happed .

my request is , how to check this problem from L2TP lns ""which is my only access router " , and estimate if the problem from pstn or not from pstn  side?

wt commands i can run it to know if the problem from LAC side or from my side ??

as i just said on customer adsl router , both adsl led and internet led is on , but no internet ,  and the customer still has a session vpdn on my L2TP LNS router .

wt commands i  need  just to check  this problem ??

regards

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