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Help in Making VPN backup to Leased line

Dear All ,

First : Kindly try to look at the Drawing down while reading ...

I have three branches linked together by leased lines ( ISP ) provide me

Now My network has LAN 1 : , LAN 2 : , LAN 3 :

LAN 1 , LAN 2 , LAN 3 connected through the leased line


you know that I can Also make LAN1, LAN2 , LAN3 Connected through VPN


My Goal Is : to make the VPN backup to the leased line

in details : make a mechanis or a policy to ping on the two LANS through the Leased line , if it fails Go to the VPN connection and the same thing with the VPN

I am using at :

Branch A : Cisco Router 1841

Branch B  : Dell Sonicwall TZ100

Branch C  : Dell Sonicwall TZ100

Could you help me in Configurations to acheive my goal ??


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