Cisco IPsec VPN with Policy NAT | NAT Before Encryption Explained |
🔥 In this video, we will learn how to configure *Custom NAT Over IPsec VPN* using Cisco IOS XE in a real-world enterprise scenario.
This lab demonstrates how to perform:
✅ Policy NAT using Route-map
✅ NAT Before IPsec Encryption
✅ Crypto ACL using Post-NAT IPs
✅ Site-to-Site IPsec VPN Configuration
✅ End-to-End Verification & Troubleshooting
📌 LAB SCENARIO:
Before traffic enters the VPN tunnel, internal IP addresses are translated:
172.16.17.10 → 172.16.20.10
172.16.17.20 → 172.16.20.20
172.16.17.30 → 172.16.20.30
172.16.17.40 → 172.16.20.40
Then the translated traffic is encrypted over the IPsec tunnel.
This type of configuration is commonly used in:
✔ Enterprise VPN Deployments
✔ Mergers & Acquisitions
✔ Overlapping IP Address Scenarios
✔ MSP & B2B Connectivity
✔ Vendor VPN Integrations
📚 Topics Covered:
🔹 Policy NAT Configuration
🔹 Route-map Based NAT
🔹 NAT ACL Configuration
🔹 Crypto ACL Matching
🔹 IPsec VPN Configuration
🔹 NAT Order of Operation
🔹 VPN Verification Commands
🔹 Troubleshooting Tips
🛠 Verification Commands Used:
show ip nat translations
show crypto isakmp sa
show crypto ipsec sa
show access-list 100
👨💻 Channel: Cyber Secure with Lakshman
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