establshing real time failover internet connection switch

#1
hi all
I want to create a network setup were if one connection goes down then the back up connection will take its place and provide seamless connectivity
if anyone know the steps in xp , what hard ware is required , please do guide me
U can currently get a connection where u have to pay only 49 Rs a month to get about 100 MB from hathway , Mtnl , Tikona etc . I believe all traders should have a cheap backup like this , bcoz for most of the traders, any trade going down due to internet issues would cost a few hundreds rupees
It is always nice to be prepared for the worst
 

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