![IPSec over GRE Tunnel on IOS - How to Configure Two Cisco Routers to Create Site-to-Site VPN Tunnel - UniNets Blog IPSec over GRE Tunnel on IOS - How to Configure Two Cisco Routers to Create Site-to-Site VPN Tunnel - UniNets Blog](http://blog.uninets.com/wp-content/uploads/2020/06/IPSec-over-GRE-Tunnel-on-IOS.png)
IPSec over GRE Tunnel on IOS - How to Configure Two Cisco Routers to Create Site-to-Site VPN Tunnel - UniNets Blog
Example for Configuring the Headquarters (Cisco Router) to Manage Branches Using Efficient VPN and Establishing IPSec Tunnels - AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 CLI-based Typical Configuration Examples -
![VPN IPSec tunnel configuration between the enterprise headquarters and... | Download Scientific Diagram VPN IPSec tunnel configuration between the enterprise headquarters and... | Download Scientific Diagram](https://www.researchgate.net/publication/275605218/figure/fig3/AS:393451444162563@1470817542458/VPN-IPSec-tunnel-configuration-between-the-enterprise-headquarters-and-branch-offices.png)