IKEv1 and IKEv2 are both VPN protocols, but IKEv2 offers advantages over IKEv1 in terms of speed, security, and flexibility. While both provide secure key exchange and authentication for VPN connections, IKEv2 is more efficient, supporting faster tunnel establishment and seamless reconnection when networks change. IKEv2 also offers improved NAT traversal capabilities and built-in support for Mobility and Multihoming (MOBIKE), making it well-suited for mobile devices. Additionally, IKEv2 supports a wider range of cryptographic algorithms and provides stronger security, making it the preferred choice for modern VPN deployments.