One of the most confusing topic in VPN is GRE Over IPSec VS IPSec Over GRE.
The wireshark capture shown the major difference in the way the traffic is encrypted by IPSec.
-In the First capture (left) for IPSec Over GRE, the routing protocol is not encrypted, only the interesting traffic is encrypted.
-In the second capture (right) for GRE Over IPSec, everything is encrypted, Routing Protocol + Interesting traffic.
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