Create two IPsec-VPN connections for high availability
Example for Configuring a Tunnel Template Interface for IPSec Tunnel Setup - AR650, AR1600, and AR6100 V300R003 CLI-based Configuration Guide - VPN - Huawei
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Example for Establishing IPSec over GRE Tunnel Using a Tunnel Interface - AR650, AR1600, and AR6100 V300R003 CLI-based Configuration Guide - VPN - Huawei
Linksys Official Support - Setting up a VPN Tunnel on two (2) routers
VPN tunnel between two routers | Download Scientific Diagram
IPSec over GRE Tunnel on IOS - How to Configure Two Cisco Routers to Create Site-to-Site VPN Tunnel - UniNets Blog
LAN-to-LAN IPsec Tunnel Between Two Routers Configuration Example - Cisco
New Features | FortiGate / FortiOS 7.0.0 | Fortinet Documentation Library
Dual-router setup w/ a dedicated VPN Router: A step-by-step tutorial
Next-Hop Based Tunnels for Layer 3 VPNs | Juniper Networks
Dual Stack Tunnels over an External Interface | Junos OS | Juniper Networks
AC750 Dual-Band Wi-Fi Router with VPN, Access Point, Range Extender, Wi-Fi Bridge & WISP - EDIMAX