IPsec

IPsec secures IP traffic using encryption and integrity, commonly for VPNs.

Updated: 2026-03-05

Definition

IPsec provides confidentiality, integrity, and authentication at the IP layer.

It’s widely used for site-to-site VPNs and secure tunnels over the internet.

Key points

Encryption + integrity for IP traffic
Common for site-to-site VPNs
Adds overhead (MTU considerations)

Common mistakes

MTU/fragmentation issues causing 'some sites not loading'.
Weak crypto settings or mismatched parameters between peers.

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Related terms

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