Skip to main content

Secure Data Transmission Using IPSec

IPSec works in two different modes, Transport mode and Tunnel mode. Transport mode is the default and should be used when you want to secure data transmission within a network. It will secure traffic from endpoint to endpoint. Tunnel mode is used when you need to secure data transmission between two networks. It will secure the IP traffic from one network's border router to the other. This can be useful when you need to set up a secure connection for branch offices that connect over the insecure Internet links. Transport mode encapsulation and Tunnel mode encapsulation are shown below:

Next: Troubleshooting Security for Data Transmission