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GRE over IPSec in Cisco IOS

Shahriar 0

Cisco GRE over IPSEC

gre-ipsec-diagram
gre/ipsec diagram

In the following is a sample configuration for GRE/IPSEC in Cisco IOS devices. you can tailor this to your needs (changing encryption algorithms, IP addresses etc), just remember to make sure they are the same on both sides (except for IP of course).

In later posts we will discover how to do this scenario in other platforms like Cisco ASA and StrongSWAN on Linux.

The best guide for learning how IPSec works: http://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-77.pdf

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