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IPSec over GRE with ospf

Hi

please i need urgent help with my a network design, i want to configure an IPSec on a GRE tunnel so in case of link failure, packets will still get to its destination secured. I have 4 sites running on ospf (in same area) as the routing protocol. the network has been working properly without the GRE tunnel or IPSec. I would like to introduce the GRE tunnel into the link i have tired different methods but none has been successful, i have tried using the loopback addresses as the source and destination address of the tunnel, am not sure if am to statically route traffic to the tunnel and how to go about that or i just basically advertise the tunnel network using ospf. Any advice or solution will be very helpful, thanks all..

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Re: IPSec over GRE with ospf

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