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In this video, Keith Barker covers how to build and verify an IPSec sitetosite tunnel using virtual tunnel interfaces. He’ll walk through all of the elements you need to set up the tunnel, beginning with the theory behind it and then demonstrate a stepbystep configuration.

Setting up an IPSec Virtual Tunnel Interface (VTI) requires a few different elements. First, you’ll need an IKE Phase 1 Policy that is compatible with both routers. You’ll also need a transform set for the IPSec phase two, as well as an IPSec profile that you can apply to the tunnel interface. Setting up the tunnel interface itself requires going through a few different options, such as deciding whether you want to assign a logical IP address or leave the IP unnumbered. The process continues with specifying a source and a destination and then applying the IPSec profile that you created. Keith will give a brief overview of why these are needed and then demonstrate how to implement each piece of the puzzle.

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