Explain how the tunnel interface, static route, Internet Key Exchange (IKE) gateway, and Internet Protocol Security (IPsec) tunnel work together to carry traffic between the two sites.

### What a good answer covers - The tunnel interface is a logical forwarding interface assigned to the virtual router and VPN zone. - The remote-subnet static route points to that tunnel interface. - The IKE gateway defines how the firewall reaches and authenticates the remote peer. - The IPsec tunnel ties the gateway to the interface and selects the cryptographic profile. ### The concept These objects solve different parts of the connection. The route decides where packets for the remote LAN should go. The tunnel interface is the logical outgoing interface selected by that route. IKE negotiates the security association with the remote firewall, and IPsec protects the traffic carried through the established connection. A correct configuration therefore needs both a usable route and a functioning peer negotiation. ### Terms - **IKE**: Internet Key Exchange. Negotiates security associations. - **IPsec**: Internet Protocol Security. Protects IP traffic. - **LAN**: Local Area Network. A network at one site. ### Remember Routing selects the tunnel; IKE establishes the peer relationship; IPsec protects the traffic.