On Thu, 29 Oct 2015, Tom Harbert wrote:

I am looking at migrating from Strongswan to libreswan on an Ubuntu 14.04 
system.

# dpkg -l | grep libreswan
ii  libreswan                           1:3.14-1                         amd64  
      Internet Key
Exchange daemon

Is it possible to implement IPSec over a virtual tunnel interfaces (VTI) ?  In 
strongswan, to do this a
mark is set under the connection profile (mark=x) and this corresponds to the 
tunnel interface key:

$ ip link add $INTERFACE type vti local $LOCAL_IP remote $REMOTE_IP key $KEY

What is $INTERFACE filled in with? vtixx where xx is the mark?
What is $KEY?

AWS require VTI as opposed to GRE tunnels.

I'm happy to write a patch to support this, but I'm not sure yet I fully
understand the setup.

Paul
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