https://github.com/hwdsl2/setup-ipsec-vpn
hwdsl2/setup-ipsec-vpn
Scripts to build your own IPsec VPN server, with IPsec/L2TP and Cisco IPsec on Ubuntu, Debian and CentOS - hwdsl2/setup-ipsec-vpn
github.com
위 링크 하단에 wireguard 라는 차세대 vpn도 좋아 보입니다.