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How to setup an IPSec connection from my ubuntu laptop to Amazon EC2 instance? I tried setting it up using elastic IP and VPC with the following openswan configuration but it is not working.

conn host-to-host

    left=%defaultroute
    leftsubnet=EC2PRIVATEIP/32 # Local netmask
    leftid=ELASTICIP
    leftrsasigkey=
    connaddrfamily=ipv4
    right=1laptopip # Remote IP address
    rightid=laptopip
    rightrsasigkey=
    ike=aes128 # IKE algorithms (AES cipher)
    esp=aes128 # ESP algorithns (AES cipher)
    auto=add
    pfs=yes
    forceencaps=yes
    type=tunnel
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I have published a startup script to setup an Amazon EC2 instance with IPSec/L2TP VPN. You can do it in less than 5 minutes, you dont even need to actually log into the machine.

The good thing with IPSec/L2TP: it works out of the box for most clients (tested with Mac OS Lion and Mountain Lion, not Linux yet).

You can get it here and get some background information about it on this site

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