Tran Ngoc Minh DucNetworking
Zero Trust Network Architecture
WireGuard-based zero trust network with identity-aware access control and micro-segmentation.
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Problem Statement
Traditional VPN-based remote access created broad network access, lacked device posture checks, and couldn't enforce least-privilege network policies.
Solution
Implemented a zero trust architecture using WireGuard mesh networking, Headscale for coordination, and OPA for policy-based access control. Replaced site-to-site VPNs with identity-verified micro-tunnels.
Technology Stack
WireGuard
Headscale
OPA
Cilium
CrowdSec
Terraform
Challenges
- Migrating from legacy VPN without service disruption
- Handling NAT traversal in diverse network environments
- Enforcing network policies at L3/L4 and L7 consistently
Lessons Learned
- Zero trust is a journey — start with admin access, then expand
- Device identity is as important as user identity
- Network policies need automated testing like application code