connections {

   gw-gw {
      local_addrs  = 192.168.0.2
      remote_addrs = 192.168.0.1

      local {
         certs = sunCert.pem
         id = sun.strongswan.org
      }
      remote {
         auth = pubkey
         id = moon.strongswan.org
      }
      children {
         net-net {
            local_ts  = 10.4.0.0/14
            remote_ts = 10.0.0.0/14

            mark_in = 8
            set_mark_in = %same
            mark_out = 4

            updown = /etc/mark_updown
            esp_proposals = aes128gcm128-x25519
         }
      }
      version = 2
      mobike = no
      proposals = aes128-sha256-x25519
   }
}
