[strongSwan] GRE encapsulation within IPSec

Florin Andrei florin at andrei.myip.org
Tue May 5 22:31:16 CEST 2015

Running strongSwan on Linux, connecting with various IPSec appliances at 
the other end - Cisco ISR, VPN concentrators, etc.

In some cases, it would help if I could create a GRE tunnel inside 
IPSec, terminated on a virtual interface on my end. If the tunnel was 
Cisco / Cisco, this would be trivial. But it's Linux (strongSwan) / 

Is there a way to terminate GRE tunnels with Linux, assuming GRE is 
within the IPSec tunnel?

Florin Andrei

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