What is the default encryption cipher for VPN connections?
If you use OpenVPN 2.4 or later and do not specify a cipher in your OpenVPN configuration file, then
AES-256-GCM is used by default. If use a version of OpenVPN older than v2.4 then
AES-256-CBC will be used as the default.
If you use WireGuard, ChaCha20 is in place to encapsulate packets.