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Chapter 3 Configuration
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temporarily disconnected.
3.6.3.5.2.2 An Example of Configuring a LAN-to-LAN IPSec VPN Connection
Background of the Example
The branch office establishes an IPSec VPN tunnel with the head office to connect two
private networks by leveraging the Internet infrastructure. The routers are installed in
the head office and branch office accordingly.
Application Diagram
Network Configuration and Security Plan
We want to setup a security channel between branch office and head office using LAN-
to-LAN tunnel-mode connection. ESP, with MD5 as the authentication protocol and AES
as the encryption protocol is decided as the policy of security plan. Pre-shared key is
defined as 8 characters, 12345678.
Branch Office Head Office
Local Network ID 192.168.0.0/24 192.168.1.0/24
Local Router IP 69.1.121.30 69.1.121.3
Remote Network ID 192.168.1.0/24 192.168.0.0/24
Remote Router IP 69.1.121.3 69.1.121.30
IKE Pre-shared Key 12345678 12345678
VPN Connection Type Tunnel mode Tunnel mode
Security Algorithm ESP:MD5 with AES ESP:MD5 with AES