IPsec VPN Main Mode (IOS-IOS)

Introduction

In this lesson, we will configure a basic site-to-site IPsec VPN between two IOS routers using main mode and pre-shared keys. This setup is essential for securely connecting two networks over the internet, ensuring that data transmitted between them is encrypted and protected from eavesdropping.

Topology & Device Table

          +------------------+
          |      R1         |
          |  1.1.1.1/32     |
          |  F0/0           |
          |                  |
          |  10.1.12.1/24   |
          +------------------+
                  |
                  |  (VLAN 120)
                  |
          +------------------+
          |      R2         |
          |  2.2.2.2/32     |
          |  G0/0           |
          |                  |
          |  10.1.12.2/24   |
          +------------------+