root@foo:~# cat /etc/ipsec.conf
config setup
  charondebug="ike 3, knl 3, cfg 3"
  uniqueids=no

conn ikev2-psk
  auto=add
  compress=no
  type=tunnel
  keyexchange=ikev2
  fragmentation=yes
  forceencaps=yes
  ike=aes256-sha512-modp2048s256!
  esp=aes256gcm16!
  dpdaction=clear
  dpddelay=300s
  rekey=no
  left=%any
  leftid=@server.domain.my
  leftcert=/etc/letsencrypt/live/server.domain.my/fullchain.pem
  leftsendcert=always
  leftsubnet=0.0.0.0/0
  right=%any
  rightid=%any
  rightauth=secret
  rightsourceip=172.18.72.0/24
  rightdns=1.0.0.1,1.1.1.1
  rightsendcert=never
  type=tunnel