https://docs.oracle.com/en/learn/stsvpn-btw-ociregions/index.html#introduction https://brendg.co.uk/2024/02/28/creating-a-site-to-site-vpn-in-oracle-oci-using-a-raspberry-pi-%F0%9F%8C%8F/ https://www.ateam-oracle.com/post/libreswan-ipsec-bgp-frr https://docs.oracle.com/en-us/iaas/Content/Network/Reference/libreswanCPE.htm#config