IPSec VPN Troubleshooting: A Structured Approach
A systematic approach to diagnosing site-to-site VPN connectivity, routing, policy and phase negotiation issues.
Why this matters
Good infrastructure decisions begin with a clear understanding of requirements, dependencies, security and lifecycle needs.
1. Assess the current environment
Document topology, addressing, connectivity, hardware, dependencies, security controls and operational processes.
2. Define requirements and priorities
Consider availability, performance, security, capacity, manageability, future growth and operational support.
3. Design for security and resilience
Use appropriate segmentation, access controls, redundancy and monitoring.
4. Implement with documentation
Plan changes, test critical paths, document configurations and maintain an accurate as-built record.
5. Review and optimize
Review infrastructure periodically for capacity, configuration quality, lifecycle status and changing business requirements.