Part 6. VPN

Table of Contents

42. IPSec Basics
42.1. IPSec
42.2. Public-Key Cryptography
42.3. Certificates
42.4. IPSec connections
42.5. Algorithms
42.6. Limitations
42.7. Compatibility with Other IPSec Peers
43. Key Management
43.1. Own Keys
43.1.1. Certificate Authorities (CAs)
43.2. Foreign Keys
44. Connecting Individual PCs
44.1. Method
44.2. Preparing the configuration on the Intra2net system
44.2.1. Create certificate
44.2.2. Default settings for new connections
44.3. Automatic configuration for clients on the Intra2net system
44.4. Manual configuration on the Intra2net system
44.4.1. Prerequisites
44.4.2. Default Settings
44.4.3. Authentication
44.4.4. Configuring the Tunnel
44.4.5. Rights
44.4.6. Activation
45. VPN with the NCP Secure Entry Windows Client
45.1. Import
45.2. Establish connection
45.3. Connection protocols
46. VPN with the Shrew Soft VPN Client
46.1. Import
46.2. Establishing Connection
46.3. Connection Protocols
47. VPN with Mac OS X
47.1. Installation
47.2. Generating Certificates
47.3. Importing Certificates
47.4. Configuring Connections
47.5. Intra2net System
48. VPN with the NCP Secure Entry macOS Client
49. VPN with the Apple iOS devices
50. VPN with Android
50.1. Preparing the Device
50.2. Certificates
50.3. Connection on the Intra2net System
50.4. Connecting with Android
50.5. Simplify Connection Setup
50.6. Connection Logs
51. VPN with the NCP Secure Android Client Premium
52. Connecting Complete Networks
52.1. Method
52.2. Configuration on the Intra2net System
52.2.1. Prerequisites
52.2.2. Default Settings
52.2.3. Authentication
52.2.4. Configuring the Tunnel
52.2.5. Rights
52.2.6. Activation
53. VPN with ZyXEL ZyWALL USG
53.1. Overview
53.2. Preparation
53.3. Certificate
53.4. Connection
53.4.1. IKE / Phase 1
53.4.2. IPSec / Phase 2
53.5. Intra2net System
53.6. Logs
54. VPN with Lancom Routers
54.1. Overview
54.2. Certificate for the Lancom device
54.3. Certificate for the Intra2net System
54.4. Connecting
54.5. Intra2net System
54.6. Deleting Certificates
55. VPN with Linux
55.1. Overview
55.2. Generating Certificates
55.3. Configuring Connections
55.4. Intra2net System
56. Solving IP Address Conflicts in VPNs Through NAT
56.1. The Problem
56.2. Configuration
56.3. Same IPs on LAN and Peer
56.3.1. Implementation
56.4. Multiple Peers with the Same IPs
56.4.1. Implementation
56.5. Local IPs Defined by Service Provider for Remote Maintenance
56.5.1. Implementation
57. Error Diagnosis
57.1. Reading Logs
57.2. The Protocol Format of the Intra2net System
57.3. Error in Phase 1
57.4. Error in Phase 2