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Terminology
IPsec is a family of protocols used to protect IP traffic, commonly with IKE for negotiation and ESP for protected traffic. WireGuard is a modern VPN protocol using a small fixed cryptographic design. SSL/TLS VPN is a broad vendor term for VPN services using TLS-based transport; implementations differ substantially between vendors.
Comparison
| Technology | Strength | Typical fit | Key consideration |
|---|---|---|---|
| IPsec | Broad firewall/router interoperability. | Site-to-site and enterprise remote access. | Proposal, selector, routing and NAT complexity can be significant. |
| WireGuard | Small, modern protocol with straightforward configuration. | Modern site links and controlled remote access. | Identity and management are often built around keys and external systems rather than a universal enterprise AAA model. |
| SSL/TLS VPN | Strong vendor integration for client access. | Remote access where the platform provides it. | Implementation, client behaviour and capabilities vary by vendor. |
IPsec
IPsec is widely supported by enterprise firewalls, routers and operating systems. It is a strong default where interoperability between different network vendors is important.
Its engineering model separates IKE negotiation from the Child SAs that protect traffic. This gives precise control over authentication, proposals, PFS and traffic selectors, but also creates more parameters that must match.
WireGuard
WireGuard deliberately keeps the protocol small and the cryptographic choices constrained. It uses public-key identities and a modern cryptographic construction rather than exposing a large menu of legacy algorithms.
Its simplicity can reduce configuration errors, but enterprise deployment still requires decisions about key provisioning, revocation, user/device identity, routing, address allocation and central management.
SSL/TLS VPN
“SSL VPN” is not one standard protocol in the same way that IPsec refers to a defined protocol suite. Vendors may use TLS for client VPN transport while adding proprietary authentication, posture, policy and tunnel mechanisms.
Evaluate the actual implementation rather than assuming all SSL/TLS VPNs behave the same way. Check supported clients, authentication integrations, split tunnelling, application access, logging and high-availability behaviour.
Selection criteria
| Question | Why it matters |
|---|---|
| What peers must interoperate? | Determines protocol and implementation support. |
| Site-to-site or remote access? | Changes routing, identity and client requirements. |
| How is identity managed? | Consider certificates, keys, RADIUS, identity providers and MFA. |
| Who manages endpoints? | Determines how keys/clients/configuration can be controlled. |
| What availability is required? | Check clustering, failover and re-establishment behaviour. |
| What must be logged? | Confirm the platform can provide useful security and operational evidence. |
Testing and evidence
Do not compare protocols solely with a synthetic speed test. Test the complete service: authentication, tunnel establishment, routing, DNS, application connectivity, MTU behaviour, reconnect and failover.
Capture exact throughput conditions, packet size, CPU/hardware acceleration, WAN latency and loss. For failures, collect client logs, gateway/VPN logs, route information and a short packet capture where appropriate. Preserve timestamps so evidence can be correlated across systems.
For IPsec-specific configuration, see the IPsec VPN Engineering Guide. For operational diagnosis, see the VPN Troubleshooting Guide.