What Is an IPsec VPN? Tunnel vs Transport Mode Explained
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Few things in enterprise networking spark as much confusion as the difference between a “VPN” and an “IPsec VPN.” If you’ve ever set up a remote connection or browsed cloud provider documentation, you’ve likely encountered the term IPsec. This article breaks down what IPsec VPNs actually are, how they work, and when you should choose tunnel mode over transport mode — with a clear look at how they fit into modern zero-trust and cloud-native architectures.
IPsec protocols defined: 3 core protocols (AH, ESP, IKE) ·
Encryption: AES-256 symmetric Use: AES-256 symmetric (GCM or CBC) ·
Enterprise deployment rate:OSI layer Layer 3 (Network) ·strong>
Market share: ~65% of enterprise site-to-site VPNs ·
Throughput overhead: 1–10 Gbps (hardware dependent)strong>
Quick snapshot
- IPsec is defined in RFC 4301 (IETF) as the security architecture for the Internet Protocol. RFC 4301
- Two modes: transport (protects payload only) and tunnel (encapsulates entire packet). RFC 4301
- IKEv2 key exchange standardized in RFC 7296 (IETF)
- Exact IPsec performance overhead varies heavily with hardware accelerations
- IPv6 mandatory> mandatory enforcement remains inconsistent across vendors and deployments. RFC 8200 (IETF)
twingate.com, sase.checkpoint.com, cbtnuggets.com, geeksforgeeks.org
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