IPSEC Encryption Application

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Goal: Set up a IPSEC Encryption to encrypt traffic between 10.1.1.0/24 to 10.4.1.0/24 


  1. IPsec Encryption:

  2. Why Do We Need IPsec?:

    • Confidentiality: IPsec encrypts data, preventing unauthorized access.
    • Integrity: It ensures data integrity by detecting any tampering or modification.
    • Authentication: IPsec authenticates communication partners, preventing impersonation.
    • Protection from Replay Attacks: IPsec prevents replayed packets from being accepted.

  3. Pros and Cons:

    • Pros:
      • Strong Security: IPsec provides robust security features.
      • Flexibility: It supports various encryption algorithms and key exchange methods.
      • Widely Adopted: IPsec is widely used in VPNs and network security.
    • Cons:
      • Complex Configuration: Setting up IPsec can be intricate due to multiple parameters.
      • Performance Overhead: Encryption/decryption adds processing overhead.
      • Compatibility: Ensuring compatibility across different devices can be challenging.

  4. Process to Establish an IPsec Tunnel:

    • Phase 1 (IKEv1/IKEv2):
      1. Negotiation: Initiating devices negotiate security parameters (encryption, authentication, DH group).
      2. Authentication: Mutual authentication using pre-shared keys or certificates.
      3. Key Exchange: Generate shared secret keys for Phase 2.
    • Phase 2 (IPsec):
      1. Security Associations (SA): Create SAs for inbound and outbound traffic.
      2. Traffic Encryption: Encrypt data using negotiated algorithms.
      3. Data Transfer: Secure communication between devices.
Here is the complete Lab with Script.
Note: Download the file to check the Script. 
File -> Download ( For Google Docs) 

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