Listing 1. The FreeS/WAN conn Listing for the Setup Shown in Figure 1

conn sentinel-vpn
       type=tunnel
        # Left security gateway, subnet behind it,
        # next hop toward it.
   type=tunnel
   left=1.2.3.4
   leftnexthop=1.2.3.5
   leftsubnet=192.168.0.0/24
   right=0.0.0.0
       rightnexthop=
       rightsubnet=
       keyexchange=ike
        keylife=8h
        keyingtries=0
        pfs=no
        authby=secret
        auto=add