I'm a little confused when to use a GRE tunnel and when to just use a simple VPN with IPSec tunnel.
For example, I have a development network (192.168.0.0/24) that I need to encrypt the traffic using IPSec, then tranport it over a 10.0.0.0/24 network.
The 10.0.0.0/24 network can not see the 192.168..0/24 in it's forwarding table. At the other end, the data gets unecrypted from 10.0.0.0 back to a 192.168.0.0/24. Is that just a simple VPN or GRE? The two confuses me. Thanks in advance.