Step-by-step guide to building an IKEv2 VPN server with strongSwan on CentOS 7, including certificate setup, firewall rules, and client configuration for iOS, macOS, Windows, and Android.
Comparing six VPN protocols—ShadowSocks, V2Ray, SoftEther, WireGuard, OpenConnect, and IKEv2—for connecting from China. Current situation as of 2025 and recommended protocols.
