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How do I configure a GRE tunnel to link two remote offices together while sending the traffic using a &nbsp;IPSEC to provide the maximum security and encryption for &nbsp;the traffic being passed over the internet. &nbsp; &nbsp;I am proposing to use routers on both sides which have been configured with public addresses on their outside interfaces and diverse private networks on their inside interfaces. Router A has a 10.1.x.x set of networks behind it, Router B has a set of 135.209.x.x set of networks behind it.
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How do I configure a GRE tunnel to link two remote offices together while sending the traffic using a  IPSEC to provide the maximum security and encryption for  the traffic being passed over the internet.    I am proposing to use routers on both sides which have been configured with public addresses on their outside interfaces and diverse private networks on their inside interfaces. Router A has a 10.1.x.x set of networks behind it, Router B has a set of 135.209.x.x set of networks behind it.

GRE over IPSEC Configuration for two remote offices

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.