IKEv2

IKEv2 is the Internet Key Exchange protocol that sets up IPsec security associations; together they form one of the standard, natively supported VPN options on Windows, macOS, iOS and Android. Its MOBIKE extension survives address changes, which suits mobile devices moving between Wi-Fi and cellular networks. Authentication uses certificates or pre-shared keys configured at the OS level rather than share links, so it appears less often in public text config lists. Performance is good, and the protocol is deeply standardized.