Good afternoon! I need to create an IPSEC tunnel between 2 routers. Please see the attached rudimentary illustration. The tunnel needs to go from Router A to Router D so they can get to each others internal networks. I control Router A, D, and all the managed Switches. Router B and C I have no control over. The VLAN address and VLANS are generic to illustrate the issue. Typically I would connect Router A directly to Router B and the same with C and D but that can't be done this time. Am I overthinking this? To me Router A needs a static route to get to VLAN 5 via it's next hop. Then Router D needs a static route to VLAN 2 via it's next hop. From there, just configure the IPSEC tunnel as normal and routing protocols through the tunnel. Something is telling me that won't work. I need to make sure all traffic is going into the tunnel.
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